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Adaptive radiation refers to

1. evolution of different species from a common ancestor
2. migration of members of a species to different geographical areas
3. power of adaptation in an individual to a variety of environments
4. adaptations due to geographical isolation

Correct answer: evolution of different species from a common ancestor

Solution

Adaptive radiation is the rapid diversification of a single ancestral species into multiple new species, each adapted to different niches. That matches the idea of different species arising from a common ancestor.

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