Why do scientist believe that mitochondria originated from ancient prokaryotes?

Prokaryote bacteria existed captured by anaerobic eukaryotic that scientists believe that mitochondria derived from ancient prokaryotes.
A mitochondrion exists a double-membrane-bound organelle found in most eukaryotic organisms. The mitochondrion exists popularly nicknamed the "powerhouse of the cell". Mitochondria exist found throughout the cytoplasm of almost all eukaryotic cells. Mitochondria utilize aerobic respiration to cause most of the cell's supply of adenosine triphosphate, which stands subsequently utilized throughout the cell as a source of chemical energy.
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