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Oxygen in, Carbon Dioxide out.

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Breathing breathes in the atmosphere: not the whole atmosphere obviously, but its composition. Breathing in occurs because of the necessity of oxygen-entrance and breathing out occurs because of the necessity of carbon dioxide-exit.

The air consists of 79% nitrogen and 21% oxygen and 0.04% carbon dioxide and equally tiny percentages of other gases. We breathe in this 79% nitrogen and breathe out an equal percentage. We breathe in 21% oxygen and breathe out 16% oxygen. We breathe in 0.04% carbon dioxide and breathe out 4-5% carbon dioxide.

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10y ago
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15y ago

you brethe in everything in the air but your lungs filter out the bad stuff and keep the oxygen and everything else is brethed out

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8y ago

air

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Anonymous

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3y ago

Oxygen and carbon dioxide

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Q: What do you breathe in and what do you breathe out?
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its what you breathe and what plants breathe out while they breathe that out they breathe in carbon diOxide and we breathe it out.


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