What allowed the earth’s atmosphere to increase in oxygen concentration?

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asked Mar 19, 2020 52.1k views

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Slisnychyi · Answer 1 · 2020-03-25T23:41:29+0000

Answer:

Photosynthesis by primitive plants and algae released oxygen, which gradually built up in the atmosphere. Eventually, the amount of oxygen present in the atmosphere enabled animals to evolve.

What allowed the earth’s atmosphere to increase in oxygen concentration?

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