The symbiotc theory explains that some of the organelles in eukaryotic cells were once prokaryotic microbe .
In nature, symbiosis—the close association of two or more organisms—occurs frequently. Symbiotic interactions impact the physiology of the interacting partners, affect their ecological dynamics and evolutionary processes, and eventually change the distribution of species over the world.
The endosymbiotic theory explains that some of the organelles in eukaryotic cells were once prokaryotic microbes. Mitochondria and Chloroplast are the same size as prokaryotic cells and divide by binary fission. Mitochondria and Chloroplast have their own DNA which is circular not linear.
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