The idea that natural selection led to greater tendencies to help close relatives over helping those with whom we have little genetic relation is:

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The idea that natural selection favors behaviors that promote the survival of relatives, even at a cost to one's own survival or reproduction, is known as kin selection. This explains why individuals are more likely to help close relatives, as they share a larger proportion of their genes. Prosocial behavior and altruism are related concepts but do not specifically account for the role of genetic relatedness in behavior. Communal orientation refers to a cultural value that prioritizes the needs of the group over the individual and does not necessarily involve genetic relatedness.

The Idea That Natural Selection Led to Greater Tendencies to Help