to be spoken by particular societies. In developing this line of argumentation, Ayala invokes the distinction between an adaptation (something targeted quite directly by natural selection—in this case, higher intelligence) and an exaptation (something that arises by being co-opted to serve a positive role other than its original selection-promoted function). Ayala’s distinction between ethics and moral norms is helpful but it nevertheless leaves open important questions regarding whether and to what extent particular moral norms (as well as a general moral sensibility) are genuinely adaptive for the human groups that display them (as opposed to being nonadaptive or perhaps even maladaptive on some occasions). Such questions no doubt will continue to intrigue sociobiologists and philosophers alike.
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PART III: CULTURAL EVOLUTION AND THE UNIQUENESS OF BEING HUMAN ."
In the Light of Evolution IV: The Human Condition . Washington, DC: The National Academies Press,
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