FIG. 1.16 Phylogenetic relationships among primates. (a) Humans share many features with chimpanzees. (b) Humans and chimpanzees, in turn, share more features with gorillas than they do with other species, and so on down through the evolutionary tree of primates. Treelike patterns of nested similarities are the predicted result of evolution.
Source: AP Photo/Bela Szandelszky.