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Brrunno [24]
3 years ago
5

What was the major contributor of oxygen to earth's early atmosphere?

Biology
2 answers:
erica [24]3 years ago
7 0
<span>It's a bacteria that grew along all the ocean coast that took in carbon and through photosynthesis, turned it into oxygen, the process took about a billion years.</span>
IRINA_888 [86]3 years ago
7 0
Photosynthesis I believe
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