Final answer:
Adaptive radiation is a pattern of speciation where one species evolves rapidly into several species to fill ecological niches.
Explanation:
Adaptive radiation is a pattern of speciation which involves the relatively rapid evolution from a single species to several species to fill a diversity of available ecological niches. It occurs when a population of one species disperses throughout an area and each finds a distinct niche or isolated habitat, leading to multiple speciation events originating from a single species.
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