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Which process is most responsible for the increase in early Earth's atmospheric oxygen levels?

Which process is most responsible for the increase in early Earth's atmospheric oxygen levels?
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3 votes
Which process is most responsible for the increase in early Earth's atmospheric oxygen levels?

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User Sithu
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2 Answers

3 votes
i would say condensation. 
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User Pikaurd
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7.8k points
3 votes
Photosynthesis is the best choice 
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User Fergus Bown
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