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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。
youdao
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One is known technically as kin selection, and familiarly as nepotism.
一种就是所谓的血缘选择，即家庭亲戚关系。
youdao
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One is known technically as kin selection, and familiarly as nepotism.
一种就是所谓的血缘选择，即家庭亲戚关系。
youdao