now have a phylogenetically acquired predisposition to cannibalism as a morally acceptable habits? This seems unlikely. Parental care is a behavior typically favored by natural choice that could be current in virtually all codes of morality, from primitive to more superior societies. There are other human behaviors sanctioned by ethical norms that have biological correlates favored by pure selection. One instance is monogamy, which occurs in some animal species but not in lots of others. It can also be sanctioned in lots of human cultures, but certainly not in all.