GLYN GOODWIN / SCIENCE PHOTO LIBRARY GLYN GOODWIN / SCIENCE PHOTO LIBRARY
Human evolution. Conceptual artwork showing how behaviour observed in modern chimpanzees, such as digging roots out of the ground, may be similar to that used by early humans. At left, a human is holding a tool and smoking a cigarette, while the chimpanzee at right is imitating this using twigs and branches. Modern humans and chimpanzees share a common ancestor in their evolutionary tree, dating to around 6 million years ago.
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