<div class="xblock xblock-public_view xblock-public_view-vertical" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="vertical" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="VerticalStudentView" data-usage-id="block-v1:MITx+16.00x+2T2019+type@vertical+block@532535b2b6504a3285a1f901cffed58d"> <h2 class="hd hd-2 unit-title">Review of Concepts: ECLSS Operational Modes</h2> <div class="vert-mod"> <div class="vert vert-0" data-id="block-v1:MITx+16.00x+2T2019+type@html+block@127d606d83a04e0da3a65b3f548907e5"> <div class="xblock xblock-public_view xblock-public_view-html xmodule_display xmodule_HtmlBlock" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="html" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@html+block@127d606d83a04e0da3a65b3f548907e5"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "HTMLModule"} </script> <h2>3.6.1&nbsp;Review of Concepts: ECLSS Operational Modes</h2> <p><button border-radius="2px" class="mo_button" onclick="window.location.href='/courses/course-v1:MITx+16.00x+3T2016/5e0e82a56b234a2aaf12ac0b3359c3c5#MO32';" style="cursor: pointer;" title="MO 3.2: Define open-loop and closed-loop ECLSS and explain the key distinctions between the two modes" type="button" id="LD">MO 3.2</button></p> </div> </div> <div class="vert vert-1" data-id="block-v1:MITx+16.00x+2T2019+type@problem+block@3ea907e3bb55420286d424be18022be1"> <div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-has-score="True" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="problem" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@problem+block@3ea907e3bb55420286d424be18022be1"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "Problem"} </script> <div id="problem_3ea907e3bb55420286d424be18022be1" class="problems-wrapper" role="group" aria-labelledby="3ea907e3bb55420286d424be18022be1-problem-title" data-problem-id="block-v1:MITx+16.00x+2T2019+type@problem+block@3ea907e3bb55420286d424be18022be1" data-url="/courses/course-v1:MITx+16.00x+2T2019/xblock/block-v1:MITx+16.00x+2T2019+type@problem+block@3ea907e3bb55420286d424be18022be1/handler/xmodule_handler" data-problem-score="0.0" data-problem-total-possible="2.0" data-attempts-used="0" data-content=" &lt;h3 class=&#34;hd hd-3 problem-header&#34; id=&#34;3ea907e3bb55420286d424be18022be1-problem-title&#34; aria-describedby=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@3ea907e3bb55420286d424be18022be1-problem-progress&#34; tabindex=&#34;-1&#34;&gt; Open-Loop vs. Closed-Loop ECLSS &lt;/h3&gt; &lt;div class=&#34;problem-progress&#34; id=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@3ea907e3bb55420286d424be18022be1-problem-progress&#34;&gt;&lt;/div&gt; &lt;div class=&#34;problem&#34;&gt; &lt;div&gt; &lt;p&gt;In &lt;a href=&#34;/courses/course-v1:MITx+16.00x+2T2019/jump_to_id/5009b8e226e64c57957092db1b8d021a&#34;&gt;Subsection 3.2.1&lt;/a&gt; we discussed the differences between open-loop and closed-loop ECLSS. For the 10 statements listed below, determine whether each statement is characteristic of open-loop or closed-loop ECLSS, and drag it into the appropriate bin. Please make sure that the outline of each draggable statement fits entirely within the outline of one bin or the other (it is okay to overlap objects). &lt;/p&gt; &lt;div class=&#34;wrapper-problem-response&#34; tabindex=&#34;-1&#34; aria-label=&#34;Question 1&#34; role=&#34;group&#34;&gt;&lt;div id=&#34;inputtype_3ea907e3bb55420286d424be18022be1_2_1&#34; class=&#34;capa_inputtype&#34;&gt; &lt;div class=&#34;drag_and_drop_problem_div&#34; id=&#34;drag_and_drop_div_3ea907e3bb55420286d424be18022be1_2_1&#34; data-plain-id=&#34;3ea907e3bb55420286d424be18022be1_2_1&#34;&gt; &lt;/div&gt; &lt;div class=&#34;drag_and_drop_problem_json&#34; id=&#34;drag_and_drop_json_3ea907e3bb55420286d424be18022be1_2_1&#34; style=&#34;display:none;&#34;&gt;{&#34;target_outline&#34;: &#34;False&#34;, &#34;one_per_target&#34;: &#34;true&#34;, &#34;targets&#34;: [], &#34;base_image&#34;: &#34;/assets/courseware/v1/8272977a84dd9e2c847246480f4d4e2e/asset-v1:MITx+16.00x+2T2019+type@asset+block/ECLSS_OL_CL_dnd_blank_round700.jpg&#34;, &#34;draggables&#34;: [{&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Extra equipment results in higher launch mass before the crossover point in mission duration&#34;, &#34;id&#34;: &#34;CL_mass&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Less reliable (more parts that can fail)&#34;, &#34;id&#34;: &#34;CL_reliable&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Resource requirements scale linearly with mission duration, with lower launch mass before the crossover point&#34;, &#34;id&#34;: &#34;OL_mass&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;More reliable (few moving parts)&#34;, &#34;id&#34;: &#34;OL_reliable&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Relatively simple&#34;, &#34;id&#34;: &#34;OL_simple&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Higher power and thermal control requirements&#34;, &#34;id&#34;: &#34;CL_requirements&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Waste products are recycled to provide reusable resources &#34;, &#34;id&#34;: &#34;CL_resources&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Primary resources are brought from Earth, and waste products are discarded&#34;, &#34;id&#34;: &#34;OL_resources&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Higher resupply requirements&#34;, &#34;id&#34;: &#34;OL_requirements&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;More complex and expensive&#34;, &#34;id&#34;: &#34;CL_simple&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}]}&lt;/div&gt; &lt;div class=&#34;script_placeholder&#34; data-src=&#34;/static/js/capa/drag_and_drop.a31124208b9b.js&#34;/&gt; &lt;div class=&#34;unanswered&#34; id=&#34;status_3ea907e3bb55420286d424be18022be1_2_1&#34;&gt; &lt;input type=&#34;text&#34; name=&#34;input_3ea907e3bb55420286d424be18022be1_2_1&#34; id=&#34;input_3ea907e3bb55420286d424be18022be1_2_1&#34; aria-describedby=&#34;answer_3ea907e3bb55420286d424be18022be1_2_1&#34; value=&#34;&#34; style=&#34;display:none;&#34;/&gt; &lt;p class=&#34;indicator-container drag-and-drop--status&#34; aria-describedby=&#34;input_3ea907e3bb55420286d424be18022be1_2_1&#34;&gt; &lt;span class=&#34;status unanswered&#34; id=&#34;status_3ea907e3bb55420286d424be18022be1_2_1&#34; data-tooltip=&#34;Not yet answered.&#34;&gt; &lt;span class=&#34;sr&#34;&gt;unanswered&lt;/span&gt;&lt;span class=&#34;status-icon&#34; aria-hidden=&#34;true&#34;/&gt; &lt;/span&gt; &lt;/p&gt; &lt;p id=&#34;answer_3ea907e3bb55420286d424be18022be1_2_1&#34; class=&#34;answer&#34;/&gt; &lt;/div&gt; &lt;/div&gt;&lt;script type=&#34;text/javascript&#34; src=&#34;/assets/courseware/v1/c5a72cdba617092eb404736ef314d71b/asset-v1:MITx+16.00x+2T2019+type@asset+block/dragDropTouchSupport2.js&#34;/&gt; &lt;/div&gt; &lt;div class=&#34;solution-span&#34;&gt; &lt;span id=&#34;solution_3ea907e3bb55420286d424be18022be1_solution_1&#34;/&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;action&#34;&gt; &lt;input type=&#34;hidden&#34; name=&#34;problem_id&#34; value=&#34;Open-Loop vs. Closed-Loop ECLSS&#34; /&gt; &lt;div class=&#34;submit-attempt-container&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;submit btn-brand&#34; data-submitting=&#34;Submitting&#34; data-value=&#34;Submit&#34; data-should-enable-submit-button=&#34;True&#34; aria-describedby=&#34;submission_feedback_3ea907e3bb55420286d424be18022be1&#34; &gt; &lt;span class=&#34;submit-label&#34;&gt;Submit&lt;/span&gt; &lt;/button&gt; &lt;div class=&#34;submission-feedback&#34; id=&#34;submission_feedback_3ea907e3bb55420286d424be18022be1&#34;&gt; &lt;span class=&#34;sr&#34;&gt;Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;problem-action-buttons-wrapper&#34;&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-gentle-alert is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-exclamation-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;3ea907e3bb55420286d424be18022be1-problem-title&#34;&gt; &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-save is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-save&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;3ea907e3bb55420286d424be18022be1-problem-title&#34;&gt;None &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification general notification-show-answer is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-info-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;3ea907e3bb55420286d424be18022be1-problem-title&#34;&gt;Answers are displayed within the problem &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; " data-graded="True"> <p class="loading-spinner"> <i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i> <span class="sr">Loading&hellip;</span> </p> </div> </div> </div> </div> </div>

<div class="xblock xblock-public_view xblock-public_view-vertical" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="vertical" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="VerticalStudentView" data-usage-id="block-v1:MITx+16.00x+2T2019+type@vertical+block@c03bf3a6341748b5a4359f26b377db5b"> <h2 class="hd hd-2 unit-title">Review of Concepts: Air Recycling Systems</h2> <div class="vert-mod"> <div class="vert vert-0" data-id="block-v1:MITx+16.00x+2T2019+type@html+block@b0edce3a12664ea09a220172c0fb8df0"> <div class="xblock xblock-public_view xblock-public_view-html xmodule_display xmodule_HtmlBlock" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="html" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@html+block@b0edce3a12664ea09a220172c0fb8df0"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "HTMLModule"} </script> <h2>3.6.2&nbsp;Review of Concepts: Air Recycling Systems</h2> <p><button border-radius="2px" class="mo_button" onclick="window.location.href='/courses/course-v1:MITx+16.00x+3T2016/5e0e82a56b234a2aaf12ac0b3359c3c5#MO32';" style="cursor: pointer;" title="MO 3.2: Define open-loop and closed-loop ECLSS and explain the key distinctions between the two modes" type="button" id="LD">MO 3.2</button> <button border-radius="2px" class="mo_button" onclick="window.location.href='/courses/course-v1:MITx+16.00x+3T2016/5e0e82a56b234a2aaf12ac0b3359c3c5#MO34';" style="cursor: pointer;" title="MO 3.4: Describe the various ways in which oxygen can be provided for the spacecraft atmosphere" type="button" id="LD">MO 3.4</button> <button border-radius="2px" class="mo_button" onclick="window.location.href='/courses/course-v1:MITx+16.00x+3T2016/5e0e82a56b234a2aaf12ac0b3359c3c5#MO35';" style="cursor: pointer;" title="MO 3.5: Describe the various ways in which carbon dioxide can be removed from the spacecraft atmosphere" type="button" id="LD">MO 3.5</button></p> </div> </div> <div class="vert vert-1" data-id="block-v1:MITx+16.00x+2T2019+type@problem+block@1dd73dce4067412fb8661c6f82f29395"> <div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-has-score="True" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="problem" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@problem+block@1dd73dce4067412fb8661c6f82f29395"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "Problem"} </script> <div id="problem_1dd73dce4067412fb8661c6f82f29395" class="problems-wrapper" role="group" aria-labelledby="1dd73dce4067412fb8661c6f82f29395-problem-title" data-problem-id="block-v1:MITx+16.00x+2T2019+type@problem+block@1dd73dce4067412fb8661c6f82f29395" data-url="/courses/course-v1:MITx+16.00x+2T2019/xblock/block-v1:MITx+16.00x+2T2019+type@problem+block@1dd73dce4067412fb8661c6f82f29395/handler/xmodule_handler" data-problem-score="0.0" data-problem-total-possible="4.0" data-attempts-used="0" data-content=" &lt;h3 class=&#34;hd hd-3 problem-header&#34; id=&#34;1dd73dce4067412fb8661c6f82f29395-problem-title&#34; aria-describedby=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@1dd73dce4067412fb8661c6f82f29395-problem-progress&#34; tabindex=&#34;-1&#34;&gt; Oxygen Production and Carbon Dioxide Removal &lt;/h3&gt; &lt;div class=&#34;problem-progress&#34; id=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@1dd73dce4067412fb8661c6f82f29395-problem-progress&#34;&gt;&lt;/div&gt; &lt;div class=&#34;problem&#34;&gt; &lt;div&gt; &lt;p&gt;In this unit, we learned about several methods for supplying oxygen to the spacecraft atmosphere, as well as for removing carbon dioxide from the atmosphere. Classify each of the following methods according to whether it is used to supply oxygen or remove CO\(_2\), and whether it is most closely associated with an open-loop or closed-loop process. Drag each method into the correct bin, and make sure that the outline of each draggable object fits entirely within the outline of the bin (it is okay to overlap objects). &lt;/p&gt; &lt;div class=&#34;wrapper-problem-response&#34; tabindex=&#34;-1&#34; aria-label=&#34;Question 1&#34; role=&#34;group&#34;&gt;&lt;div id=&#34;inputtype_1dd73dce4067412fb8661c6f82f29395_2_1&#34; class=&#34;capa_inputtype&#34;&gt; &lt;div class=&#34;drag_and_drop_problem_div&#34; id=&#34;drag_and_drop_div_1dd73dce4067412fb8661c6f82f29395_2_1&#34; data-plain-id=&#34;1dd73dce4067412fb8661c6f82f29395_2_1&#34;&gt; &lt;/div&gt; &lt;div class=&#34;drag_and_drop_problem_json&#34; id=&#34;drag_and_drop_json_1dd73dce4067412fb8661c6f82f29395_2_1&#34; style=&#34;display:none;&#34;&gt;{&#34;target_outline&#34;: &#34;False&#34;, &#34;one_per_target&#34;: &#34;true&#34;, &#34;targets&#34;: [], &#34;base_image&#34;: &#34;/assets/courseware/v1/4f3feb3e1651c29b2f91328dc9bf6e39/asset-v1:MITx+16.00x+2T2019+type@asset+block/ECLSS_air_dnd_blank_round700.jpg&#34;, &#34;draggables&#34;: [{&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Metal oxide (Metox) absorbers&#34;, &#34;id&#34;: &#34;CO2_metox&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Chlorate candles&#34;, &#34;id&#34;: &#34;O2_candles&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;High pressure and/or cryogenic storage tanks&#34;, &#34;id&#34;: &#34;O2_tanks&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Rapid cycling amine (RCA) systems&#34;, &#34;id&#34;: &#34;CO2_amine&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Lithium hydroxide (LiOH) granules&#34;, &#34;id&#34;: &#34;CO2_LiOH&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}, {&#34;can_reuse&#34;: &#34;&#34;, &#34;label&#34;: &#34;Water electrolysis&#34;, &#34;id&#34;: &#34;O2_electrolysis&#34;, &#34;icon&#34;: &#34;&#34;, &#34;target_fields&#34;: []}]}&lt;/div&gt; &lt;div class=&#34;script_placeholder&#34; data-src=&#34;/static/js/capa/drag_and_drop.a31124208b9b.js&#34;/&gt; &lt;div class=&#34;unanswered&#34; id=&#34;status_1dd73dce4067412fb8661c6f82f29395_2_1&#34;&gt; &lt;input type=&#34;text&#34; name=&#34;input_1dd73dce4067412fb8661c6f82f29395_2_1&#34; id=&#34;input_1dd73dce4067412fb8661c6f82f29395_2_1&#34; aria-describedby=&#34;answer_1dd73dce4067412fb8661c6f82f29395_2_1&#34; value=&#34;&#34; style=&#34;display:none;&#34;/&gt; &lt;p class=&#34;indicator-container drag-and-drop--status&#34; aria-describedby=&#34;input_1dd73dce4067412fb8661c6f82f29395_2_1&#34;&gt; &lt;span class=&#34;status unanswered&#34; id=&#34;status_1dd73dce4067412fb8661c6f82f29395_2_1&#34; data-tooltip=&#34;Not yet answered.&#34;&gt; &lt;span class=&#34;sr&#34;&gt;unanswered&lt;/span&gt;&lt;span class=&#34;status-icon&#34; aria-hidden=&#34;true&#34;/&gt; &lt;/span&gt; &lt;/p&gt; &lt;p id=&#34;answer_1dd73dce4067412fb8661c6f82f29395_2_1&#34; class=&#34;answer&#34;/&gt; &lt;/div&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;solution-span&#34;&gt; &lt;span id=&#34;solution_1dd73dce4067412fb8661c6f82f29395_solution_1&#34;/&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;action&#34;&gt; &lt;input type=&#34;hidden&#34; name=&#34;problem_id&#34; value=&#34;Oxygen Production and Carbon Dioxide Removal&#34; /&gt; &lt;div class=&#34;submit-attempt-container&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;submit btn-brand&#34; data-submitting=&#34;Submitting&#34; data-value=&#34;Submit&#34; data-should-enable-submit-button=&#34;True&#34; aria-describedby=&#34;submission_feedback_1dd73dce4067412fb8661c6f82f29395&#34; &gt; &lt;span class=&#34;submit-label&#34;&gt;Submit&lt;/span&gt; &lt;/button&gt; &lt;div class=&#34;submission-feedback&#34; id=&#34;submission_feedback_1dd73dce4067412fb8661c6f82f29395&#34;&gt; &lt;span class=&#34;sr&#34;&gt;Some problems have options such as save, reset, hints, or show answer. 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<div class="xblock xblock-public_view xblock-public_view-vertical" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="vertical" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="VerticalStudentView" data-usage-id="block-v1:MITx+16.00x+2T2019+type@vertical+block@7b82d44d53b44f5dbab3001fc6aaa11b"> <h2 class="hd hd-2 unit-title">Review of Concepts: Oxygen Metabolism and Hypoxia</h2> <div class="vert-mod"> <div class="vert vert-0" data-id="block-v1:MITx+16.00x+2T2019+type@html+block@dbaf3ebec77247eabe2f31e8130ea16a"> <div class="xblock xblock-public_view xblock-public_view-html xmodule_display xmodule_HtmlBlock" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="html" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@html+block@dbaf3ebec77247eabe2f31e8130ea16a"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "HTMLModule"} </script> <h2>3.6.3&nbsp;Review of Concepts: Oxygen Metabolism and Hypoxia</h2> <p><button border-radius="2px" class="mo_button" onclick="window.location.href='/courses/course-v1:MITx+16.00x+3T2016/5e0e82a56b234a2aaf12ac0b3359c3c5#MO34';" style="cursor: pointer;" title="MO 3.4: Describe the various ways in which oxygen can be provided for the spacecraft atmosphere" type="button" id="LD">MO 3.4</button></p> </div> </div> <div class="vert vert-1" data-id="block-v1:MITx+16.00x+2T2019+type@problem+block@bdff19959b5a46f38ede31d272bc0ca5"> <div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-has-score="True" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="problem" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@problem+block@bdff19959b5a46f38ede31d272bc0ca5"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "Problem"} </script> <div id="problem_bdff19959b5a46f38ede31d272bc0ca5" class="problems-wrapper" role="group" aria-labelledby="bdff19959b5a46f38ede31d272bc0ca5-problem-title" data-problem-id="block-v1:MITx+16.00x+2T2019+type@problem+block@bdff19959b5a46f38ede31d272bc0ca5" data-url="/courses/course-v1:MITx+16.00x+2T2019/xblock/block-v1:MITx+16.00x+2T2019+type@problem+block@bdff19959b5a46f38ede31d272bc0ca5/handler/xmodule_handler" data-problem-score="0.0" data-problem-total-possible="6.0" data-attempts-used="0" data-content=" &lt;h3 class=&#34;hd hd-3 problem-header&#34; id=&#34;bdff19959b5a46f38ede31d272bc0ca5-problem-title&#34; aria-describedby=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@bdff19959b5a46f38ede31d272bc0ca5-problem-progress&#34; tabindex=&#34;-1&#34;&gt; Failure of Oxygen Production System &lt;/h3&gt; &lt;div class=&#34;problem-progress&#34; id=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@bdff19959b5a46f38ede31d272bc0ca5-problem-progress&#34;&gt;&lt;/div&gt; &lt;div class=&#34;problem&#34;&gt; &lt;div&gt; &lt;p&gt;Consider a cylindrical crew module with a diameter of 5 meters, a length of 15 meters, and a crew of 6 people. The module contains air that is at standard sea-level atmospheric pressure and temperature. The sea level density of air at 20 degrees Celsius is 1.204 kg/m\(^3\). Additional information necessary to solve this problem (e.g., daily oxygen metabolic rate, cabin atmosphere composition) can be found in the videos in &lt;a href=&#34;/courses/course-v1:MITx+16.00x+2T2019/jump_to_id/a41c159e93ac4e598e805446468d610a&#34;&gt;Subsection 3.2.2&lt;/a&gt; and &lt;a href=&#34;/courses/course-v1:MITx+16.00x+2T2019/jump_to_id/b1c85020bd9d471f9b709af697bb858f&#34;&gt;Subsection 3.3.2&lt;/a&gt;.&lt;/p&gt; &lt;div class=&#34;wrapper-problem-response&#34; tabindex=&#34;-1&#34; aria-label=&#34;Question 1&#34; role=&#34;group&#34;&gt;&lt;div id=&#34;formulaequationinput_bdff19959b5a46f38ede31d272bc0ca5_2_1&#34; class=&#34;inputtype formulaequationinput&#34;&gt; &lt;div class=&#34;unanswered&#34;&gt; &lt;label class=&#34;problem-group-label&#34; for=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_2_1&#34; id=&#34;label_bdff19959b5a46f38ede31d272bc0ca5_2_1&#34;&gt;What is the volume of the crew module? Provide your answer in m\(^3\) with at least 2 decimal places.&lt;/label&gt; &lt;input type=&#34;text&#34; name=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_2_1&#34; id=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_2_1&#34; data-input-id=&#34;bdff19959b5a46f38ede31d272bc0ca5_2_1&#34; value=&#34;&#34; aria-describedby=&#34;status_bdff19959b5a46f38ede31d272bc0ca5_2_1&#34; size=&#34;20&#34;/&gt; &lt;span class=&#34;trailing_text&#34; id=&#34;trailing_text_bdff19959b5a46f38ede31d272bc0ca5_2_1&#34;/&gt; &lt;span class=&#34;status unanswered&#34; id=&#34;status_bdff19959b5a46f38ede31d272bc0ca5_2_1&#34; data-tooltip=&#34;Not yet answered.&#34;&gt; &lt;span class=&#34;sr&#34;&gt;unanswered&lt;/span&gt;&lt;span class=&#34;status-icon&#34; aria-hidden=&#34;true&#34;/&gt; &lt;/span&gt; &lt;p id=&#34;answer_bdff19959b5a46f38ede31d272bc0ca5_2_1&#34; class=&#34;answer&#34;/&gt; &lt;div id=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_2_1_preview&#34; class=&#34;equation&#34;&gt; \(\) &lt;img src=&#34;/static/images/spinner.bc34f953403f.gif&#34; class=&#34;loading&#34; alt=&#34;Loading&#34;/&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;script_placeholder&#34; data-src=&#34;/static/js/capa/src/formula_equation_preview.b1967ab28c31.js&#34;/&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;solution-span&#34;&gt; &lt;span id=&#34;solution_bdff19959b5a46f38ede31d272bc0ca5_solution_1&#34;/&gt; &lt;/div&gt;&lt;div class=&#34;wrapper-problem-response&#34; tabindex=&#34;-1&#34; aria-label=&#34;Question 2&#34; role=&#34;group&#34;&gt;&lt;div id=&#34;formulaequationinput_bdff19959b5a46f38ede31d272bc0ca5_3_1&#34; class=&#34;inputtype formulaequationinput&#34;&gt; &lt;div class=&#34;unanswered&#34;&gt; &lt;label class=&#34;problem-group-label&#34; for=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_3_1&#34; id=&#34;label_bdff19959b5a46f38ede31d272bc0ca5_3_1&#34;&gt;Assuming typical atmospheric composition in the crew module, what is the mass of oxygen in the cabin under normal operating conditions? Provide your answer in kg with at least 2 decimal places.&lt;/label&gt; &lt;input type=&#34;text&#34; name=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_3_1&#34; id=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_3_1&#34; data-input-id=&#34;bdff19959b5a46f38ede31d272bc0ca5_3_1&#34; value=&#34;&#34; aria-describedby=&#34;status_bdff19959b5a46f38ede31d272bc0ca5_3_1&#34; size=&#34;20&#34;/&gt; &lt;span class=&#34;trailing_text&#34; id=&#34;trailing_text_bdff19959b5a46f38ede31d272bc0ca5_3_1&#34;/&gt; &lt;span class=&#34;status unanswered&#34; id=&#34;status_bdff19959b5a46f38ede31d272bc0ca5_3_1&#34; data-tooltip=&#34;Not yet answered.&#34;&gt; &lt;span class=&#34;sr&#34;&gt;unanswered&lt;/span&gt;&lt;span class=&#34;status-icon&#34; aria-hidden=&#34;true&#34;/&gt; &lt;/span&gt; &lt;p id=&#34;answer_bdff19959b5a46f38ede31d272bc0ca5_3_1&#34; class=&#34;answer&#34;/&gt; &lt;div id=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_3_1_preview&#34; class=&#34;equation&#34;&gt; \(\) &lt;img src=&#34;/static/images/spinner.bc34f953403f.gif&#34; class=&#34;loading&#34; alt=&#34;Loading&#34;/&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;script_placeholder&#34; data-src=&#34;/static/js/capa/src/formula_equation_preview.b1967ab28c31.js&#34;/&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;solution-span&#34;&gt; &lt;span id=&#34;solution_bdff19959b5a46f38ede31d272bc0ca5_solution_2&#34;/&gt; &lt;/div&gt;&lt;div class=&#34;wrapper-problem-response&#34; tabindex=&#34;-1&#34; aria-label=&#34;Question 3&#34; role=&#34;group&#34;&gt;&lt;div id=&#34;formulaequationinput_bdff19959b5a46f38ede31d272bc0ca5_4_1&#34; class=&#34;inputtype formulaequationinput&#34;&gt; &lt;div class=&#34;unanswered&#34;&gt; &lt;label class=&#34;problem-group-label&#34; for=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_4_1&#34; id=&#34;label_bdff19959b5a46f38ede31d272bc0ca5_4_1&#34;&gt;Suppose the oxygen production system fails and the amount of oxygen in the cabin decreases due to crew respiration. The cabin pressurization system will continue to supply nitrogen to maintain an overall sea level pressure, and the CO2 scrubbing system will continue to keep CO2 at acceptable levels. Hypoxia will begin to set in when the VOLUME percentage of oxygen in the atmosphere drops to about 15%. Assuming normal metabolic rates for each crew member, how long does the crew have before the oxygen level reaches the hypoxic threshold? Enter your answer in days with at least 2 decimal places.&lt;/label&gt; &lt;input type=&#34;text&#34; name=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_4_1&#34; id=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_4_1&#34; data-input-id=&#34;bdff19959b5a46f38ede31d272bc0ca5_4_1&#34; value=&#34;&#34; aria-describedby=&#34;status_bdff19959b5a46f38ede31d272bc0ca5_4_1&#34; size=&#34;20&#34;/&gt; &lt;span class=&#34;trailing_text&#34; id=&#34;trailing_text_bdff19959b5a46f38ede31d272bc0ca5_4_1&#34;/&gt; &lt;span class=&#34;status unanswered&#34; id=&#34;status_bdff19959b5a46f38ede31d272bc0ca5_4_1&#34; data-tooltip=&#34;Not yet answered.&#34;&gt; &lt;span class=&#34;sr&#34;&gt;unanswered&lt;/span&gt;&lt;span class=&#34;status-icon&#34; aria-hidden=&#34;true&#34;/&gt; &lt;/span&gt; &lt;p id=&#34;answer_bdff19959b5a46f38ede31d272bc0ca5_4_1&#34; class=&#34;answer&#34;/&gt; &lt;div id=&#34;input_bdff19959b5a46f38ede31d272bc0ca5_4_1_preview&#34; class=&#34;equation&#34;&gt; \(\) &lt;img src=&#34;/static/images/spinner.bc34f953403f.gif&#34; class=&#34;loading&#34; alt=&#34;Loading&#34;/&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;script_placeholder&#34; data-src=&#34;/static/js/capa/src/formula_equation_preview.b1967ab28c31.js&#34;/&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;solution-span&#34;&gt; &lt;span id=&#34;solution_bdff19959b5a46f38ede31d272bc0ca5_solution_3&#34;/&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;action&#34;&gt; &lt;input type=&#34;hidden&#34; name=&#34;problem_id&#34; value=&#34;Failure of Oxygen Production System&#34; /&gt; &lt;div class=&#34;submit-attempt-container&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;submit btn-brand&#34; data-submitting=&#34;Submitting&#34; data-value=&#34;Submit&#34; data-should-enable-submit-button=&#34;True&#34; aria-describedby=&#34;submission_feedback_bdff19959b5a46f38ede31d272bc0ca5&#34; &gt; &lt;span class=&#34;submit-label&#34;&gt;Submit&lt;/span&gt; &lt;/button&gt; &lt;div class=&#34;submission-feedback&#34; id=&#34;submission_feedback_bdff19959b5a46f38ede31d272bc0ca5&#34;&gt; &lt;span class=&#34;sr&#34;&gt;Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;problem-action-buttons-wrapper&#34;&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-gentle-alert is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-exclamation-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;bdff19959b5a46f38ede31d272bc0ca5-problem-title&#34;&gt; &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-save is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-save&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;bdff19959b5a46f38ede31d272bc0ca5-problem-title&#34;&gt;None &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification general notification-show-answer is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-info-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;bdff19959b5a46f38ede31d272bc0ca5-problem-title&#34;&gt;Answers are displayed within the problem &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; " data-graded="True"> <p class="loading-spinner"> <i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i> <span class="sr">Loading&hellip;</span> </p> </div> </div> </div> </div> </div>

<div class="xblock xblock-public_view xblock-public_view-vertical" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="vertical" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="VerticalStudentView" data-usage-id="block-v1:MITx+16.00x+2T2019+type@vertical+block@3fa2cd428537435089e73b7adc48deae"> <h2 class="hd hd-2 unit-title">Review of Concepts: Carbon Dioxide Toxicity</h2> <div class="vert-mod"> <div class="vert vert-0" data-id="block-v1:MITx+16.00x+2T2019+type@html+block@bf7127f471894716a6304b56734f83e2"> <div class="xblock xblock-public_view xblock-public_view-html xmodule_display xmodule_HtmlBlock" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="html" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@html+block@bf7127f471894716a6304b56734f83e2"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "HTMLModule"} </script> <h2>3.6.4&nbsp;Review of Concepts: Carbon Dioxide&nbsp;Toxicity</h2> <p><button border-radius="2px" class="mo_button" onclick="window.location.href='/courses/course-v1:MITx+16.00x+3T2016/5e0e82a56b234a2aaf12ac0b3359c3c5#MO35';" style="cursor: pointer;" title="MO 3.5: Describe the various ways in which carbon dioxide can be removed from the spacecraft atmosphere" type="button" id="LD">MO 3.5</button></p> </div> </div> <div class="vert vert-1" data-id="block-v1:MITx+16.00x+2T2019+type@problem+block@c0a7cf92e6e3406c8bccd51875d694fb"> <div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-has-score="True" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="problem" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@problem+block@c0a7cf92e6e3406c8bccd51875d694fb"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "Problem"} </script> <div id="problem_c0a7cf92e6e3406c8bccd51875d694fb" class="problems-wrapper" role="group" aria-labelledby="c0a7cf92e6e3406c8bccd51875d694fb-problem-title" data-problem-id="block-v1:MITx+16.00x+2T2019+type@problem+block@c0a7cf92e6e3406c8bccd51875d694fb" data-url="/courses/course-v1:MITx+16.00x+2T2019/xblock/block-v1:MITx+16.00x+2T2019+type@problem+block@c0a7cf92e6e3406c8bccd51875d694fb/handler/xmodule_handler" data-problem-score="0.0" data-problem-total-possible="3.0" data-attempts-used="0" data-content=" &lt;h3 class=&#34;hd hd-3 problem-header&#34; id=&#34;c0a7cf92e6e3406c8bccd51875d694fb-problem-title&#34; aria-describedby=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@c0a7cf92e6e3406c8bccd51875d694fb-problem-progress&#34; tabindex=&#34;-1&#34;&gt; Failure of Carbon Dioxide Scrubbing System &lt;/h3&gt; &lt;div class=&#34;problem-progress&#34; id=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@c0a7cf92e6e3406c8bccd51875d694fb-problem-progress&#34;&gt;&lt;/div&gt; &lt;div class=&#34;problem&#34;&gt; &lt;div&gt; &lt;div class=&#34;wrapper-problem-response&#34; tabindex=&#34;-1&#34; aria-label=&#34;Question 1&#34; role=&#34;group&#34;&gt;&lt;p&gt;Following on the previous problem, now consider what would happen if instead of a failure in the oxygen production system, there is a failure in the carbon dioxide scrubbing system. To solve the following problem, use the same information about the crew module as before, as well as additional information (e.g., daily CO\(_2\) production rate) from the video in &lt;a href=&#34;/courses/course-v1:MITx+16.00x+2T2019/jump_to_id/a41c159e93ac4e598e805446468d610a&#34;&gt;Subsection 3.2.2&lt;/a&gt;.&lt;/p&gt; &lt;div id=&#34;formulaequationinput_c0a7cf92e6e3406c8bccd51875d694fb_2_1&#34; class=&#34;inputtype formulaequationinput&#34;&gt; &lt;div class=&#34;unanswered&#34;&gt; &lt;label class=&#34;problem-group-label&#34; for=&#34;input_c0a7cf92e6e3406c8bccd51875d694fb_2_1&#34; id=&#34;label_c0a7cf92e6e3406c8bccd51875d694fb_2_1&#34;&gt;CO\(_2\) levels above 5% of atmospheric composition are considered dangerously toxic. Assume that the amount of CO\(_2\) in the spacecraft atmosphere prior to the failure of the scrubbing system is negligible. 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These options follow the Submit button.&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;problem-action-buttons-wrapper&#34;&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-gentle-alert is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-exclamation-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;c0a7cf92e6e3406c8bccd51875d694fb-problem-title&#34;&gt; &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-save is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-save&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;c0a7cf92e6e3406c8bccd51875d694fb-problem-title&#34;&gt;None &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification general notification-show-answer is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-info-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;c0a7cf92e6e3406c8bccd51875d694fb-problem-title&#34;&gt;Answers are displayed within the problem &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; " data-graded="True"> <p class="loading-spinner"> <i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i> <span class="sr">Loading&hellip;</span> </p> </div> </div> </div> </div> </div>

<div class="xblock xblock-public_view xblock-public_view-vertical" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="vertical" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="VerticalStudentView" data-usage-id="block-v1:MITx+16.00x+2T2019+type@vertical+block@a6d8b8e5679145f78417833b1da95aff"> <h2 class="hd hd-2 unit-title">Review of Concepts: Water Recycling Systems</h2> <div class="vert-mod"> <div class="vert vert-0" data-id="block-v1:MITx+16.00x+2T2019+type@html+block@48c7ebbf76e04a1dbc059d1c5446064a"> <div class="xblock xblock-public_view xblock-public_view-html xmodule_display xmodule_HtmlBlock" data-has-score="False" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="html" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@html+block@48c7ebbf76e04a1dbc059d1c5446064a"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "HTMLModule"} </script> <h2>3.6.5&nbsp;Review of Concepts: Water Recycling Systems</h2> <p><button border-radius="2px" class="mo_button" onclick="window.location.href='/courses/course-v1:MITx+16.00x+3T2016/5e0e82a56b234a2aaf12ac0b3359c3c5#MO37';" style="cursor: pointer;" title="MO 3.7: Describe how water is purified and recycled in the spacecraft environment" type="button" id="LD">MO 3.7</button></p> </div> </div> <div class="vert vert-1" data-id="block-v1:MITx+16.00x+2T2019+type@problem+block@cca6c6fdcab841b6ab6a207cab485bd1"> <div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-has-score="True" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="problem" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@problem+block@cca6c6fdcab841b6ab6a207cab485bd1"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "Problem"} </script> <div id="problem_cca6c6fdcab841b6ab6a207cab485bd1" class="problems-wrapper" role="group" aria-labelledby="cca6c6fdcab841b6ab6a207cab485bd1-problem-title" data-problem-id="block-v1:MITx+16.00x+2T2019+type@problem+block@cca6c6fdcab841b6ab6a207cab485bd1" data-url="/courses/course-v1:MITx+16.00x+2T2019/xblock/block-v1:MITx+16.00x+2T2019+type@problem+block@cca6c6fdcab841b6ab6a207cab485bd1/handler/xmodule_handler" data-problem-score="0.0" data-problem-total-possible="3.0" data-attempts-used="0" data-content=" &lt;h3 class=&#34;hd hd-3 problem-header&#34; id=&#34;cca6c6fdcab841b6ab6a207cab485bd1-problem-title&#34; aria-describedby=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@cca6c6fdcab841b6ab6a207cab485bd1-problem-progress&#34; tabindex=&#34;-1&#34;&gt; Characteristics of the Grey Water Stream &lt;/h3&gt; &lt;div class=&#34;problem-progress&#34; id=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@cca6c6fdcab841b6ab6a207cab485bd1-problem-progress&#34;&gt;&lt;/div&gt; &lt;div class=&#34;problem&#34;&gt; &lt;div&gt; &lt;p&gt;Which of the following are part of the &#39;grey water&#39; stream in water recycling? Check all that apply. You will receive points for each correct answer, and lose a half point for each incorrect answer.&lt;/p&gt; &lt;div class=&#34;wrapper-problem-response&#34; tabindex=&#34;-1&#34; aria-label=&#34;Question 1&#34; role=&#34;group&#34;&gt;&lt;div class=&#34;choicegroup capa_inputtype&#34; id=&#34;inputtype_cca6c6fdcab841b6ab6a207cab485bd1_2_1&#34;&gt; &lt;fieldset aria-describedby=&#34;status_cca6c6fdcab841b6ab6a207cab485bd1_2_1&#34;&gt; &lt;div class=&#34;field&#34;&gt; &lt;input type=&#34;checkbox&#34; name=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1[]&#34; id=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1_choice_0&#34; class=&#34;field-input input-checkbox&#34; value=&#34;choice_0&#34;/&gt;&lt;label id=&#34;cca6c6fdcab841b6ab6a207cab485bd1_2_1-choice_0-label&#34; for=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1_choice_0&#34; class=&#34;response-label field-label label-inline&#34; aria-describedby=&#34;status_cca6c6fdcab841b6ab6a207cab485bd1_2_1&#34;&gt; &lt;text&gt;a) Human perspiration&lt;/text&gt; &lt;/label&gt; &lt;/div&gt; &lt;div class=&#34;field&#34;&gt; &lt;input type=&#34;checkbox&#34; name=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1[]&#34; id=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1_choice_1&#34; class=&#34;field-input input-checkbox&#34; value=&#34;choice_1&#34;/&gt;&lt;label id=&#34;cca6c6fdcab841b6ab6a207cab485bd1_2_1-choice_1-label&#34; for=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1_choice_1&#34; class=&#34;response-label field-label label-inline&#34; aria-describedby=&#34;status_cca6c6fdcab841b6ab6a207cab485bd1_2_1&#34;&gt; &lt;text&gt;b) Dirty wash water&lt;/text&gt; &lt;/label&gt; &lt;/div&gt; &lt;div class=&#34;field&#34;&gt; &lt;input type=&#34;checkbox&#34; name=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1[]&#34; id=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1_choice_2&#34; class=&#34;field-input input-checkbox&#34; value=&#34;choice_2&#34;/&gt;&lt;label id=&#34;cca6c6fdcab841b6ab6a207cab485bd1_2_1-choice_2-label&#34; for=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1_choice_2&#34; class=&#34;response-label field-label label-inline&#34; aria-describedby=&#34;status_cca6c6fdcab841b6ab6a207cab485bd1_2_1&#34;&gt; &lt;text&gt;c) Urine&lt;/text&gt; &lt;/label&gt; &lt;/div&gt; &lt;div class=&#34;field&#34;&gt; &lt;input type=&#34;checkbox&#34; name=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1[]&#34; id=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1_choice_3&#34; class=&#34;field-input input-checkbox&#34; value=&#34;choice_3&#34;/&gt;&lt;label id=&#34;cca6c6fdcab841b6ab6a207cab485bd1_2_1-choice_3-label&#34; for=&#34;input_cca6c6fdcab841b6ab6a207cab485bd1_2_1_choice_3&#34; class=&#34;response-label field-label label-inline&#34; aria-describedby=&#34;status_cca6c6fdcab841b6ab6a207cab485bd1_2_1&#34;&gt; &lt;text&gt;d) Human breath&lt;/text&gt; &lt;/label&gt; &lt;/div&gt; &lt;span id=&#34;answer_cca6c6fdcab841b6ab6a207cab485bd1_2_1&#34;/&gt; &lt;/fieldset&gt; &lt;div class=&#34;indicator-container&#34;&gt; &lt;span class=&#34;status unanswered&#34; id=&#34;status_cca6c6fdcab841b6ab6a207cab485bd1_2_1&#34; data-tooltip=&#34;Not yet answered.&#34;&gt; &lt;span class=&#34;sr&#34;&gt;unanswered&lt;/span&gt;&lt;span class=&#34;status-icon&#34; aria-hidden=&#34;true&#34;/&gt; &lt;/span&gt; &lt;/div&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;solution-span&#34;&gt; &lt;span id=&#34;solution_cca6c6fdcab841b6ab6a207cab485bd1_solution_1&#34;/&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;action&#34;&gt; &lt;input type=&#34;hidden&#34; name=&#34;problem_id&#34; value=&#34;Characteristics of the Grey Water Stream&#34; /&gt; &lt;div class=&#34;submit-attempt-container&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;submit btn-brand&#34; data-submitting=&#34;Submitting&#34; data-value=&#34;Submit&#34; data-should-enable-submit-button=&#34;True&#34; aria-describedby=&#34;submission_feedback_cca6c6fdcab841b6ab6a207cab485bd1&#34; &gt; &lt;span class=&#34;submit-label&#34;&gt;Submit&lt;/span&gt; &lt;/button&gt; &lt;div class=&#34;submission-feedback&#34; id=&#34;submission_feedback_cca6c6fdcab841b6ab6a207cab485bd1&#34;&gt; &lt;span class=&#34;sr&#34;&gt;Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;problem-action-buttons-wrapper&#34;&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-gentle-alert is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-exclamation-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;cca6c6fdcab841b6ab6a207cab485bd1-problem-title&#34;&gt; &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-save is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-save&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;cca6c6fdcab841b6ab6a207cab485bd1-problem-title&#34;&gt;None &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification general notification-show-answer is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-info-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;cca6c6fdcab841b6ab6a207cab485bd1-problem-title&#34;&gt;Answers are displayed within the problem &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; " data-graded="True"> <p class="loading-spinner"> <i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i> <span class="sr">Loading&hellip;</span> </p> </div> </div> </div> <div class="vert vert-2" data-id="block-v1:MITx+16.00x+2T2019+type@problem+block@96bee525a2ae4a30a7faa8ffd77170cf"> <div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-has-score="True" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="problem" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@problem+block@96bee525a2ae4a30a7faa8ffd77170cf"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "Problem"} </script> <div id="problem_96bee525a2ae4a30a7faa8ffd77170cf" class="problems-wrapper" role="group" aria-labelledby="96bee525a2ae4a30a7faa8ffd77170cf-problem-title" data-problem-id="block-v1:MITx+16.00x+2T2019+type@problem+block@96bee525a2ae4a30a7faa8ffd77170cf" data-url="/courses/course-v1:MITx+16.00x+2T2019/xblock/block-v1:MITx+16.00x+2T2019+type@problem+block@96bee525a2ae4a30a7faa8ffd77170cf/handler/xmodule_handler" data-problem-score="0.0" data-problem-total-possible="1.0" data-attempts-used="0" data-content=" &lt;h3 class=&#34;hd hd-3 problem-header&#34; id=&#34;96bee525a2ae4a30a7faa8ffd77170cf-problem-title&#34; aria-describedby=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@96bee525a2ae4a30a7faa8ffd77170cf-problem-progress&#34; tabindex=&#34;-1&#34;&gt; Residue Stream &lt;/h3&gt; &lt;div class=&#34;problem-progress&#34; id=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@96bee525a2ae4a30a7faa8ffd77170cf-problem-progress&#34;&gt;&lt;/div&gt; &lt;div class=&#34;problem&#34;&gt; &lt;div&gt; &lt;div class=&#34;wrapper-problem-response&#34; tabindex=&#34;-1&#34; aria-label=&#34;Question 1&#34; role=&#34;group&#34;&gt;&lt;div id=&#34;inputtype_96bee525a2ae4a30a7faa8ffd77170cf_2_1&#34; class=&#34; capa_inputtype textline&#34;&gt; &lt;div class=&#34;unanswered &#34;&gt; &lt;label class=&#34;problem-group-label&#34; for=&#34;input_96bee525a2ae4a30a7faa8ffd77170cf_2_1&#34; id=&#34;label_96bee525a2ae4a30a7faa8ffd77170cf_2_1&#34;&gt;The residue left over after most of the urine is processed into &#39;grey water&#39; is called _____. 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These options follow the Submit button.&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;problem-action-buttons-wrapper&#34;&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-gentle-alert is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-exclamation-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;96bee525a2ae4a30a7faa8ffd77170cf-problem-title&#34;&gt; &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-save is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-save&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;96bee525a2ae4a30a7faa8ffd77170cf-problem-title&#34;&gt;None &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification general notification-show-answer is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-info-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;96bee525a2ae4a30a7faa8ffd77170cf-problem-title&#34;&gt;Answers are displayed within the problem &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; " data-graded="True"> <p class="loading-spinner"> <i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i> <span class="sr">Loading&hellip;</span> </p> </div> </div> </div> <div class="vert vert-3" data-id="block-v1:MITx+16.00x+2T2019+type@problem+block@cdae2ea322ff4597a21920ef5ff97d9e"> <div class="xblock xblock-public_view xblock-public_view-problem xmodule_display xmodule_ProblemBlock" data-has-score="True" data-runtime-class="LmsRuntime" data-graded="True" data-request-token="90a62570ea7011efbdc212d4917dea95" data-runtime-version="1" data-block-type="problem" data-course-id="course-v1:MITx+16.00x+2T2019" data-init="XBlockToXModuleShim" data-usage-id="block-v1:MITx+16.00x+2T2019+type@problem+block@cdae2ea322ff4597a21920ef5ff97d9e"> <script type="json/xblock-args" class="xblock-json-init-args"> {"xmodule-type": "Problem"} </script> <div id="problem_cdae2ea322ff4597a21920ef5ff97d9e" class="problems-wrapper" role="group" aria-labelledby="cdae2ea322ff4597a21920ef5ff97d9e-problem-title" data-problem-id="block-v1:MITx+16.00x+2T2019+type@problem+block@cdae2ea322ff4597a21920ef5ff97d9e" data-url="/courses/course-v1:MITx+16.00x+2T2019/xblock/block-v1:MITx+16.00x+2T2019+type@problem+block@cdae2ea322ff4597a21920ef5ff97d9e/handler/xmodule_handler" data-problem-score="0.0" data-problem-total-possible="3.0" data-attempts-used="0" data-content=" &lt;h3 class=&#34;hd hd-3 problem-header&#34; id=&#34;cdae2ea322ff4597a21920ef5ff97d9e-problem-title&#34; aria-describedby=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@cdae2ea322ff4597a21920ef5ff97d9e-problem-progress&#34; tabindex=&#34;-1&#34;&gt; ISS Water Usage &lt;/h3&gt; &lt;div class=&#34;problem-progress&#34; id=&#34;block-v1:MITx+16.00x+2T2019+type@problem+block@cdae2ea322ff4597a21920ef5ff97d9e-problem-progress&#34;&gt;&lt;/div&gt; &lt;div class=&#34;problem&#34;&gt; &lt;div&gt; &lt;p&gt;After the final stage of water purification in the US segment of the ISS, the water _____. Check all that apply. You will receive points for each correct answer, and lose about a half point for each incorrect answer.&lt;/p&gt; &lt;div class=&#34;wrapper-problem-response&#34; tabindex=&#34;-1&#34; aria-label=&#34;Question 1&#34; role=&#34;group&#34;&gt;&lt;div class=&#34;choicegroup capa_inputtype&#34; id=&#34;inputtype_cdae2ea322ff4597a21920ef5ff97d9e_2_1&#34;&gt; &lt;fieldset aria-describedby=&#34;status_cdae2ea322ff4597a21920ef5ff97d9e_2_1&#34;&gt; &lt;div class=&#34;field&#34;&gt; &lt;input type=&#34;checkbox&#34; name=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1[]&#34; id=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_0&#34; class=&#34;field-input input-checkbox&#34; value=&#34;choice_0&#34;/&gt;&lt;label id=&#34;cdae2ea322ff4597a21920ef5ff97d9e_2_1-choice_0-label&#34; for=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_0&#34; class=&#34;response-label field-label label-inline&#34; aria-describedby=&#34;status_cdae2ea322ff4597a21920ef5ff97d9e_2_1&#34;&gt; &lt;text&gt;a) is dumped overboard&lt;/text&gt; &lt;/label&gt; &lt;/div&gt; &lt;div class=&#34;field&#34;&gt; &lt;input type=&#34;checkbox&#34; name=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1[]&#34; id=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_1&#34; class=&#34;field-input input-checkbox&#34; value=&#34;choice_1&#34;/&gt;&lt;label id=&#34;cdae2ea322ff4597a21920ef5ff97d9e_2_1-choice_1-label&#34; for=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_1&#34; class=&#34;response-label field-label label-inline&#34; aria-describedby=&#34;status_cdae2ea322ff4597a21920ef5ff97d9e_2_1&#34;&gt; &lt;text&gt;b) is used for drinking&lt;/text&gt; &lt;/label&gt; &lt;/div&gt; &lt;div class=&#34;field&#34;&gt; &lt;input type=&#34;checkbox&#34; name=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1[]&#34; id=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_2&#34; class=&#34;field-input input-checkbox&#34; value=&#34;choice_2&#34;/&gt;&lt;label id=&#34;cdae2ea322ff4597a21920ef5ff97d9e_2_1-choice_2-label&#34; for=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_2&#34; class=&#34;response-label field-label label-inline&#34; aria-describedby=&#34;status_cdae2ea322ff4597a21920ef5ff97d9e_2_1&#34;&gt; &lt;text&gt;c) is sent to the Sabatier reactor&lt;/text&gt; &lt;/label&gt; &lt;/div&gt; &lt;div class=&#34;field&#34;&gt; &lt;input type=&#34;checkbox&#34; name=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1[]&#34; id=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_3&#34; class=&#34;field-input input-checkbox&#34; value=&#34;choice_3&#34;/&gt;&lt;label id=&#34;cdae2ea322ff4597a21920ef5ff97d9e_2_1-choice_3-label&#34; for=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_3&#34; class=&#34;response-label field-label label-inline&#34; aria-describedby=&#34;status_cdae2ea322ff4597a21920ef5ff97d9e_2_1&#34;&gt; &lt;text&gt;d) is sent to the oxygen production system&lt;/text&gt; &lt;/label&gt; &lt;/div&gt; &lt;div class=&#34;field&#34;&gt; &lt;input type=&#34;checkbox&#34; name=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1[]&#34; id=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_4&#34; class=&#34;field-input input-checkbox&#34; value=&#34;choice_4&#34;/&gt;&lt;label id=&#34;cdae2ea322ff4597a21920ef5ff97d9e_2_1-choice_4-label&#34; for=&#34;input_cdae2ea322ff4597a21920ef5ff97d9e_2_1_choice_4&#34; class=&#34;response-label field-label label-inline&#34; aria-describedby=&#34;status_cdae2ea322ff4597a21920ef5ff97d9e_2_1&#34;&gt; &lt;text&gt;e) can be used in the ISS crew shower&lt;/text&gt; &lt;/label&gt; &lt;/div&gt; &lt;span id=&#34;answer_cdae2ea322ff4597a21920ef5ff97d9e_2_1&#34;/&gt; &lt;/fieldset&gt; &lt;div class=&#34;indicator-container&#34;&gt; &lt;span class=&#34;status unanswered&#34; id=&#34;status_cdae2ea322ff4597a21920ef5ff97d9e_2_1&#34; data-tooltip=&#34;Not yet answered.&#34;&gt; &lt;span class=&#34;sr&#34;&gt;unanswered&lt;/span&gt;&lt;span class=&#34;status-icon&#34; aria-hidden=&#34;true&#34;/&gt; &lt;/span&gt; &lt;/div&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;solution-span&#34;&gt; &lt;span id=&#34;solution_cdae2ea322ff4597a21920ef5ff97d9e_solution_1&#34;/&gt; &lt;/div&gt;&lt;/div&gt; &lt;div class=&#34;action&#34;&gt; &lt;input type=&#34;hidden&#34; name=&#34;problem_id&#34; value=&#34;ISS Water Usage&#34; /&gt; &lt;div class=&#34;submit-attempt-container&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;submit btn-brand&#34; data-submitting=&#34;Submitting&#34; data-value=&#34;Submit&#34; data-should-enable-submit-button=&#34;True&#34; aria-describedby=&#34;submission_feedback_cdae2ea322ff4597a21920ef5ff97d9e&#34; &gt; &lt;span class=&#34;submit-label&#34;&gt;Submit&lt;/span&gt; &lt;/button&gt; &lt;div class=&#34;submission-feedback&#34; id=&#34;submission_feedback_cdae2ea322ff4597a21920ef5ff97d9e&#34;&gt; &lt;span class=&#34;sr&#34;&gt;Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;problem-action-buttons-wrapper&#34;&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-gentle-alert is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-exclamation-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;cdae2ea322ff4597a21920ef5ff97d9e-problem-title&#34;&gt; &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification warning notification-save is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-save&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;cdae2ea322ff4597a21920ef5ff97d9e-problem-title&#34;&gt;None &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;div class=&#34;notification general notification-show-answer is-hidden&#34; tabindex=&#34;-1&#34;&gt; &lt;span class=&#34;icon fa fa-info-circle&#34; aria-hidden=&#34;true&#34;&gt;&lt;/span&gt; &lt;span class=&#34;notification-message&#34; aria-describedby=&#34;cdae2ea322ff4597a21920ef5ff97d9e-problem-title&#34;&gt;Answers are displayed within the problem &lt;/span&gt; &lt;div class=&#34;notification-btn-wrapper&#34;&gt; &lt;button type=&#34;button&#34; class=&#34;btn btn-default btn-small notification-btn review-btn sr&#34;&gt;Review&lt;/button&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; " data-graded="True"> <p class="loading-spinner"> <i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i> <span class="sr">Loading&hellip;</span> </p> </div> </div> </div> </div> </div>