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Mitochondrial DNA has been analyzed to estimate the ancestral lineage of various species around the world, including primates. Which of the following statements about mitochondria is true?
Mitochondria are descended from once-separate, single-celled organisms which invaded a cell, stuck around, then lost their ability to live independently.
Mitochondria function in the cell to break down waste products.
Mitochondrial DNA does not mutate.
Mitochondrial DNA is only inherited by males.
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