What is the endosymbiont theory?

  1. A theory which states that all creatures will evolve into one single organism.
  2. A theory which states that eukaryotic cells evolved from prokaryotic cells.
  3. A theory which states that all living things come from within another living thing.
  4. A theory which states that prokaryotic cells evolved from eukaryotic cells.

📝 Detailed explanation

The endosymbiotic theory proposes that mitochondria and chloroplasts originated from prokaryotes living inside ancestral eukaryotic cells.
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