Question

why we need oxygen?​

Answer 1

Answer:

we need O2 to survive,digest food

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Answer 2

Answer:

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Why we need oxygen?

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Oxygen is essential for respiration because the body uses it to 'burn' food molecules. Animals take in oxygen when inhaling and give off carbon dioxide when exhaling. Oxygen makes up almost 21% of the total gases in air, with most of the remaining gas being physiologically inert nitrogen.

Explanation:

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