Studies in evolutionary biology have led to the conclusion that human beings arose from ancestral primates. This association was angrily debated among scientists in Darwin's day. But today there is no significant scientific doubt about the close evolutionary relationships among all primates or humans. The theory of evolution explains how life on Earth has changed. In scientific terms, "theory" does not mean "guess" or "hunch" as it does in everyday usage. Scientific theories are explanations of natural phenomena built up logically from testable o

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