According to the endosymbiotic origin of eukaryotic cells,respiring bacteria similar to E.coli were engulfed by cells and evolved into the

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According to endosymbiotic theory, it is believed that mitochondria, the energy-generating organelles in eukaryotic cells, evolved from respiring bacteria that were engulfed by cells. Therefore, the best choice is C, energy-generating organelles.

According to the Endosymbiotic Origin of Eukaryotic Cells,respiring Bacteria Similar