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Billions of years ago, how did earth come to have an oxygen-rich atmosphere?

Billions of years ago, how did earth come to have an oxygen-rich atmosphere?
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Billions of years ago, how did earth come to have an oxygen-rich atmosphere?

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User Uclagamer
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2 Answers

6 votes
is was due to Algae and its relation to photosynthesis.
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User SKeney
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5 votes

algae activity , just had this on apex

answered
User Jacoviza
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8.5k points
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