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Humans and chimpanzees diverged about 6 million years ago. If 12 nucleotide substitutions have occurred between human and chimpanzee lineages in a sequence of mitochondrial DNA, and 36 have occurred between humans and gibbons, humans and gibbons, according to the molecular clock, separated _______ million years ago.

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Answer:

18 million year ago :) hope i helped

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User Anton Belousov
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