Biology, 01.03.2021 01:20, odboy345

Yall Im struggling, if u cant read it, the question is “why does a mountain climber need an oxygen supply at very high altitudes, even tho the air still contains 21% oxygen?

Yall Im struggling, if u cant read it, the question is “why does a mountain climber need an oxygen

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Yall Im struggling, if u cant read it, the question is “why does a mountain climber need an oxygen s...