natural selection
noun [ U ] uk/ˌnætʃ.ər.əl sɪˈlek.ʃən/ us/ˌnætʃ.ɚ.əl sɪˈlek.ʃən/
（物种的）自然选择，物竞天择
the process that results in the continued existence of only the types of animals and plants that are best able to produce young or new plants in the conditions in which they live
Compare: survival of the fittest