Biology, 28.06.2019 23:00 rokinray

Large amounts of oxygen gas appeared in earth's atmosphere about 2.7 bya years ago, a. after photo-autotrophic prokaryotes evolved b. after eukaryotes evolved c. before anaerobic organisms evolved d. after the first organisms colonized land

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Large amounts of oxygen gas appeared in earth's atmosphere about 2.7 bya years ago, a. after photo-...

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