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Which kind of cell came first in evolution

Which kind of cell came first in the evolution - prokaryotic cell or eukaryotic cell?

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This is an interesting problem of the biological evolution. The most accepted hypothesis asserts which the simpler cell, prokaryotic cell, seemed earlier in evolution than the more complex eukaryotic cell. The endosymbiotic hypothesis, for instance, avows that aerobic eukaryotic cells seemed from the mutualist ecological interaction among aerobic prokaryotes and primitive anaerobic eukaryotes.

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