________ refers to the mechanism of evolution in isolated areas that occurs in response to otherwise unfilled ecological niches.

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Adaptive radiation is the process by which organisms diversify into new forms, in response to unoccupied ecological niches or new environmental opportunities. This occurs most often in geographically isolated areas where different populations of the same species are subjected to different selection pressures. Over time, these populations become genetically and morphologically distinct, leading to the formation of new species.

________ Refers to the Mechanism of Evolution in Isolated Areas