**Adaptive radiation** refers to:
ALoss of population due to radiation
BDiversification of a single ancestral species into many descendant species adapted to different ecological niches
CA type of genetic drift
DMutation caused by ionising radiation
Answer & Solution
Correct answer: B. Diversification of a single ancestral species into many descendant species adapted to different ecological niches
Adaptive radiation: e.g. Darwin's finches diversified from a common ancestor into 13+ species with different beak shapes specialised for different food sources on the Galápagos islands. Marsupials in Australia are another classic example.
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