CHRISTIAN JEGOU PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY CHRISTIAN JEGOU PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Human evolution. Conceptual image depicting the stages in the evolution of humans. At lower centre is an amphibian creature rising from the water. These evolved into the first land vertebrates 360 million years ago. Clockwise from this are: proconsul (23-15 million years ago) depicted as an African ape with both primitive and advanced features; Australopithecus afarensis (4-2.5 million years ago) which displayed a bipedal, upright gait walking on two legs; Homo erectus (1.5 million years ago) used fire and wooden tools; and Homo sapiens or modern man who appeared 300,000-200,000 years ago).
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