Two organelles that are believed to have once been free-living bacterial cells are __________________ and __________________.

Question

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Chloroplasts and mitochondria are believed to have evolved from free-living bacteria through endosymbiosis. This theory suggests that these organelles were once independent bacterial cells that were engulfed by another cell and eventually developed a mutually beneficial relationship, leading to the evolution of eukaryotic cells.

Two Organelles That Are Believed to Have Once Been Free-Living