natural selection造句
(151) Now the core of natural selection is the claim that phenotypic traits are selected for their adaptivity, that is, for their effect on fitness.
(152) And over time, the economic analogue of natural selection operates as the market determines which firms are profitable and which are unprofitable, and tends to winnow out the latter.
(153) Natural selection is a slower process with man than with any other creature.
(154) Because the risk is so much lower, Nunney argues, natural selection cannot drive the spread of new defenses against retinoblastoma.
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