An organelle that probably evolved from an independent organism that moved inside and began to live within a eukaryotic cell is the:

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Quizplus · Accepted Answer

Mitochondria have their own DNA and replicate independently within eukaryotic cells, suggesting that they evolved from a separate organism that was engulfed by early eukaryotic cells. This process is known as endosymbiosis. The other organelles listed (nucleus, Golgi apparatus, endoplasmic reticulum) are not thought to have evolved through endosymbiosis.

An Organelle That Probably Evolved from an Independent Organism That