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A branch of sociobiology that applies evolutionary principles to understand the biological basis of cooperation in both animals and humans. It seeks to explain how self-sacrificing, helpful, or collaborative behaviors could possibly survive the ruthless logic of natural selection. Through concepts like kin selection (helping family to pass on shared genes) and reciprocal altruism ("I'll help you now because you'll help me later"), it provides a Darwinian account of why life isn't a constant war of all against all.
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