How much oxygen does a human need per average breath of air?

In an average gasp of air, only 15-20% is oxygen. When you exhale you release around 10%. In short, 10% would be the ideal minimum.
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Do worms need air to breath?

  Yes their mouths are in there segment and you would need a microscope to see it.
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How much air does a human breath?

well they breathe tons of times during the day the average would br about 1,000,000 times a day!The average person at rest will breathe about 15 +/- times per minute meaning 4 (MORE)

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