FRIEDRICH SAURER / SCIENCE PHOTO LIBRARY FRIEDRICH SAURER / SCIENCE PHOTO LIBRARY
Australopithecus afarensis skull, computer artwork. Compared to the modern human skull the skull of A. afarensis had a more prominent brow ridge, a broader, flatter nose, a more prominent jaw and a smaller brain. A. afarensis lived between 3.9 and 2.9 million years ago and is thought to be an ancestor of modern humans.
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