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Does a cow take oxygen, or give oxygen?

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Cows do exhale oxygen.Not only that even humans exhale oxygen.But the catch is when humans inhale air,it contains ~21% oxygen and when they exhale the air it contain around 16% oxygen.Same goes for other organisms that take oxygen such as cow. read more

The cow can remove up to about 5% oxygen, so when exhaling the air from the lungs is about 16% oxygen. Another opinion: When exhaled, oxygen binds with carbon to form carbon dioxide, which is expelled as a "waste" gas. read more

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