Primate researchers have concluded that great ape cultures probably have existed for at least __________ years.

Question

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Primate researchers have concluded that great ape cultures, including tool use and social behaviors, have likely existed for millions of years. The figure of 14 million years is based on evolutionary evidence and the fossil record, indicating the long history of complex social behaviors and cultural practices in great apes, our closest living relatives.

Primate Researchers Have Concluded That Great Ape Cultures Probably Have