第一个答案是亲缘选择。
Reciprocal altruism and kin selection are the two main theories.
互利主义和亲族选择是两个主要理论。
Though not conclusive, these results fall in line with the kin selection hypothesis.
尽管并非决定性结论，但这些结果验证了同族选择假设理论。
One possible explanation is what evolutionary psychologists call the "kin selection hypothesis."
心理学家提出了一种可能的解释，称之为“亲族选择”假说。
Natural selection, which usually promotes only selfish behavior, can reward this kind of cooperative behavior, called kin selection, because relatives contain many of the same genes.
通常只会鼓励利己行为的自然进化，也会奖励这种合作行为，称为血亲进化，因为亲属之间包含很多相同的基因。
Natural selection, which usually promotes only selfish behavior, can reward this kind of cooperative behavior, called kin selection, because relatives contain many of the same genes.
通常只会鼓励利己行为的自然进化，也会奖励这种合作行为，称为血亲进化，因为亲属之间包含很多相同的基因。
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