SMETEK / SCIENCE PHOTO LIBRARY SMETEK / SCIENCE PHOTO LIBRARY
Chimpanzee-human ancestry. Conceptual image of a chimpanzee (Pan troglodytes, not to scale) with a human, representing the shared genetic ancestry of these two primates. Humans and chimpanzees, our closest relatives, share around 99 percent of their DNA. It is thought that the common ancestor of humans and chimpanzees lived as recently as five million years ago.
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