The serial endosymbiosis hypothesis states that the origin of mitochondria and chloroplasts was the result of a mutually advantageous symbiotic relationship between two eukaryotic organisms.

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The serial endosymbiosis hypothesis suggests that mitochondria and chloroplasts originated from a mutually beneficial symbiotic relationship between a eukaryotic host cell and prokaryotic organisms (not two eukaryotic organisms).

The Serial Endosymbiosis Hypothesis States That the Origin of Mitochondria