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Australopithecines, having been even slower than modern humans, would have been no match for predators. Lacking fire and stone weapons, they would also have had little ability to ward off attacks on the ground.
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From page 240... ...
The youngest gracile australopithecines are not precisely dated, but the famous Taung skull of Australopithecus africanus is now dated at about 2.3 Ma (Delson, 19881. Gracile australopithecines had existed for at least 1.5 m.y.
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