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achieved adaptive Africa agriculture American amount animals anthropologists appear associated become behavior bone called calories chimpanzees communication complex continued cultural depend domesticated East energy English Europe European evidence evolution example exchange existence fact females Figure forest function genes genetic given groups hand Hence hominid Homo Homo erectus Homo sapiens human hunters hunting hunting and gathering important increase Indians indicate individuals industrial involved known labor land language less linguistic living males means Middle million natural Neolithic occur organisms Paleolithic patterns period pigs plants Pleistocene population practice primates probably production races region relationship relatively remains reproduction result rules sapiens selection similar skin social societies species stone structure tion traits United Upper village warfare wild women World World monkeys