The most likely ancestor for today's mitochondria according to the endosymbiotic model is a(n)

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The endosymbiotic model suggests that mitochondria evolved from free-living bacteria that were engulfed by a host cell and established a symbiotic relationship. The most likely ancestor for mitochondria is believed to be a species of Rickettsia, a genus of gram-negative bacteria that are obligate intracellular parasites. This is supported by both genetic and morphological evidence.

The Most Likely Ancestor for Today's Mitochondria According to the Endosymbiotic