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Evidence of Change

Humans’ earliest ancestors appeared in about 27 million years ago. They ate and walked on four legs. Several types of early apes, called , evolved. Together with apes and monkeys, we belong to a group of mammals called . Since humans have that is similar to chimpanzees, we likely have a common . This ancestral line split about six to ten million years ago. One important feature that primates developed was the opposable . This enables primates to and tightly hold objects. Another feature is binocular . Both eyes are aimed , making it easier to judge distances.