The endosymbiotic theory says that precursor eukaryotic cells acquired cilia by endosymbiosis with a(n) _____ ancestor and others gained photosynthetic ability from endosymbiosis with a(n) _____ ancestor.

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The endosymbiotic theory suggests that eukaryotic cells acquired cilia from an endosymbiotic relationship with a spiral-shaped bacterium and gained photosynthetic ability from a cyanobacterial ancestor.

The Endosymbiotic Theory Says That Precursor Eukaryotic Cells Acquired Cilia