How did Eukaryotic cells originate?
The endosymbiosis theory is how people think Eukaryotic cells
originated. The endosymbiosis theory states that organelles
such as mitochondria and chloroplasts originated when larger
prokaryotes engulfed but did not digest smaller prokaryotes.
Mutual benefits permitted this symbiotic relationship to be
maintained, allowing the smaller cells to evolve into the
eukaryotic organelles observed today.