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

User Eric Pi
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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.
User Elheni Mokhles
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3 votes
photosynthesis I believe
User Raimue
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