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Where did the oxygen in our atmosphere come from?

Where did the oxygen in our atmosphere come from?
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Where did the oxygen in our atmosphere come from?

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User Yury Litvinov
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2 Answers

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The photosynthesis in our plants
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User Roadsunknown
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8.2k points
3 votes
The majority comes from the ocean, while a small percentage comes from trees
answered
User Kamil Naja
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8.1k points
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