Australopithecus - Australopithecus ,apes,and .

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Australopithecus Fossils and fragments of jaws suggest to scientists that the ancestors of monkeys, apes, and  humans began their evolution approximately 50 million years ago. Additional evidence for this  evolution has been derived from experiments in biochemistry and changes that occur in the DNA of  cells. Mutation rates in the DNA have been calculated, and evolutionary changes can be determined  from these calculations. By noting mutation rates, scientists can estimate the time since two species  diverged from a single ancestor, and they can develop a family tree. Scientific evidence indicates that the first hominids (humanlike creatures) belonged to a group called  Australopithecus.  Members of the genus Australopithecus are believed to have displayed a critical  step in human evolution: the ability to walk upright on two feet.  In 1924, the complete skull of a young child was found in a limestone quarry in South Africa. The 
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