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1. Oxford Dictionary

   selection pressure

   • n.
     an agent of differential mortality or fertility that tends to make a population change genetically

   • noun: selection pressure, plural noun: selection pressures

2. • 釋義

   n.

   名詞

   • 1. an agent of differential mortality or fertility that tends to make a population change genetically their range of variation is constrained by natural selection pressures imposed by their environment