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tiny-mole [99]
3 years ago
10

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:
juin [17]3 years ago
5 0
There are plenty of plants producing oxygen by photosynthesis.
Also, human's only use 5% of the oxygen in the air in respiration, there is 21% in the air.
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