Why did the crew of Apollo 13 need to make alterations to the filters/scrubbers so that they would fit into the lunar module?

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Answer

They produce O 2  that the crew was running out of.

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They remove CO 2  from the air.

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All of the answers are correct.

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They did not want to leave any equipment behind once they jettisoned the service module.

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N.A.S.A. needed to keep the astronauts busy so they would not get hypothermia.

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