Answer:
mitochondrion
Mitochondria generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy. A mitochondrion is thus termed the powerhouse of the cell. Mitochondria are commonly between 0.75 and 3 μm ² in area but vary considerably in size and structure. Unless specifically stained, they are not visible.
Explanation:
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