According to the theory of mitochondria in cells today are the descendants of aerobic prokaryotes that used oxygen to generate energy.

Endosymbiotic

Explanation:

Remember that the endosymbiotic theory says that the mitochondria was once a free prokaryotic cell that was engulfed by a larger cell this is why the mitochondria has its own DNA and it also has its own process of division separate from the cell itself.

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