Like many other animal species, Homo sapiens are said to be sexually dimorphic. Not only are male sapiens on average somewhat larger than females, but since very early in their evolutionary history, the sapiens sexes have had very distinct cultural and behavioral patterns as well. Typically, in the context of the ancient hunter-gatherer cultures from which all modern sapiens arose, the females were relegated to gathering wild plant material, maintaining the hearth, and of course, nurturing the young. In these circumstances the characteristic attributes of female sapiens - their behavioral bias to utilize social mechanisms rather than direct action, and their heightened empathy compared to males, for example - must have emerged through natural selection.
This arrangement left sapiens males in charge of hunting other animals and providing dietary protein in the form of meat. This of course involved the development of weapons, skills and cooperative strategy. In the process, the typical male sapiens aggressiveness and tendency toward risk-taking must have been selected for as well.
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