20. How have prokaryotic cells
given origin to aerobic
eukaryotic cells and to
photosynthetic aerobic
eukaryotic cells?

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According to the most
hypothesis aerobiceukaryotic cells
emerged the association of aerobic
engulfed by primitive
anaerobic cells. This would
have the origin of mitochondria
thus would have primitively
aerobic bacteria engulfed by
anaerobes. This hypothesis is the
endosymbiotic hypothesis on origin
of mitochondria.

Chloroplasts also have appeared
by from the entry of
prokaryotes into aerobic
eukaryotes, establishing a
mutualistecological interaction.