Natural selection is the process by which the variants within a species that are best adapted to survive in their environment win the reproductive contest – at least until an even better-adapted variant comes along. The traits that enable people to feed and protect themselves increase the likelihood that they will live long enough to produce offspring, whom they will be able to feed and protect until maturity.
自然选择是同一物种中最能适应环境的群体赢得生殖竞争的过程——直至出现更加适应的群体。让人们得以果腹和保护自己的特征增加了我们活得足够长能生育后代，并且把后代哺育和保护直至成年的可能性。