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Harrizon [31]
3 years ago
8

Before the evolution of life produced the process of photosynthesis, small amounts of oxygen were added to the earth's atmospher

e by the process of
Biology
1 answer:
Veronika [31]3 years ago
5 0
I think it's Photosynthesis because photosynthetic bacteria began producing excess oxygen, which added oxygen to the Earth's atmosphere.
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