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  1. Oxford American Dictionary

    natural selection

    • IPA[ˌnaCHər(ə)l səˈlekSH(ə)n]

    美式

    • n.
      the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.

    • noun: natural selection