natural selection

1. N-UNCOUNT Natural selection is a process by which species of animals and plants that are best adapted to their environment survive and reproduce, while those that are less well adapted die out. (生物的)自然选择; 物竞天择

Natural selection ensures only the fittest survive to pass their genes on to the next generation. 物竞天择确保只有最适应环境的物种才得以生存下来，把基因传递给下一代。