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Can humans survive breathing an 80/20 mix of CO2 and O2?

Asked by gorillapaws (30512points) April 27th, 2021

I was reading about the MOXIE that produced O2 on the surface of Mars. It got me wondering what the air mix would look like for explorers on Mars. If it’s O2 mixed with a gas other than CO2 like Nitrogen, where would that other gas come from?

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