kin selection

例句：

1. 1. The researchers conducted a study on the kin selection of birds.
   研究人员对鸟类的亲缘选择进行了研究。
2. 2.The kin selection theory has been widely applied in evolutionary biology.
   亲缘选择理论在进化生物学中得到了广泛应用。
3. 3. In this study, we found that kin selection plays an important role in the evolution of species.
   在这项研究中，我们发现亲缘选择在物种进化中起着重要作用。