D. ROBERTS / SCIENCE PHOTO LIBRARY D. ROBERTS / SCIENCE PHOTO LIBRARY
Primate skulls. Coloured x-rays of the skulls of a gorilla (Gorilla gorilla, left), chimpanzee (Pan trogoldytes, centre) and human (Homo sapien, left). The gorilla skull is recoginsable by its pronounced brows and small cranial capacity. The chimpanzee's cranium is larger but considerably smaller than that of the human. This image could represent evolution.
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