JEAN-FRANCOIS PODEVIN / SCIENCE PHOTO LIBRARY JEAN-FRANCOIS PODEVIN / SCIENCE PHOTO LIBRARY
Human evolution, conceptual computer artwork. Human footprint over the continent of Africa, representing the 'Out of Africa' theory of evolution. Also seen is a molecule of deoxyribonucleic acid (DNA), at left, which contains sections called genes that encode the body's genetic information. According to the 'Out of Africa' theory, anatomically modern humans evolved solely in Africa, between 200 and 100 thousand years ago.
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