What is the immediate outcome where a trait becomes common in a population because it improves fitness under current living conditions?

Answer

Adaptation

An adaptation is a trait, like fish gills or bird feathers, that has become prevalent due to the specific fitness improvement it conferred in its historical environment.

What is the immediate outcome where a trait becomes common in a population because it improves fitness under current living conditions?

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How Does Natural Selection Drive Evolution? - Science Through Time

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