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25 October, 00:07

How did an oxygen-rich atmosphere develop from a carbon dioxide-rich atmosphere? multiple choice through photosynthesis by cyanobacteria through asteroid impacts through volcanic eruptions

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  1. 25 October, 00:28
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    Through photosynthesis by cyanobacteria and plants containing chlorophyll pigment

    this is the only natural process which releases the life supporting gas oxygen into the atmosphere
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