According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?

According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?

According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?



Answer: from engulfed, originally free-living proteobacteria