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18 February, 04:31

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

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  1. 18 February, 06:09
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    Photosynthesis I believe
  2. 18 February, 07:42
    0
    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.
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