natural selection

例句：

1. 1. In nature, natural selection is the process by which organisms with traits that increase their chances of survival and reproduction are more likely to survive and reproduce.
   在自然界中，自然选择是生物具有有利于生存和繁殖的特质时更有可能存活和繁衍的过程。
2. 2. The theory of natural selection explains how species can evolve over time to become better adapted to theirenvironment.
   自然选择理论解释了物种如何随着时间的推移变得更适应其环境。
3. 3. The ability to adapt to changing environments is a key factor in the survival of many species, including humans.
   适应不断变化的环境能力是人类及其他许多物种生存的关键因素。