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According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate? *a. from infoldings of the plasma membrane, coupled with mutations of genes for proteins in energy-transfer reactionsb. from engulfed, originally free-living prokaryotesc. by secondary endosymbiosisd. from the nuclear envelope folding outward and forming mitochondrial membranese. when a protoeukaryote engaged in a symbiotic relationship with a protobiont

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