Why photosynthetic prokaryotes appeared before more, Biology

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Why is it more probable that the photosynthetic prokaryotes appeared before the aerobic eukaryotes?

It is more feasible that photosynthetic prokaryotes appeared before the aerobic eukaryotes because without photosynthesis the earth's atmosphere would not be enriched with molecular oxygen, and without oxygen the existence of aerobic beings would not be possible.

 


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