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Anna35 [415]
3 years ago
11

Most of the Earth's oxygen occurs in the form of minerals in the crust and mantle. The oxygen that is available in the atmospher

e is used primarily by plants, animals, and bacteria to perform cellular respiration.
Why is running out of oxygen still not a real concern?
Biology
1 answer:
Vlad [161]3 years ago
8 0
I think it's because of other organisms produces oxygen

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