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)自然選擇; 物競天擇

Natural selection ensures only the fittest survive to pass their genes on to the next generation. 物競天擇確保衹有最適應環境的物種才得以生存下來，把基因傳遞給下一代。