Adaptive radiation is also known as

DIVERGENT EVOLUTION

This is where a species will give rise to many species that will appear different externally but similar internally. In evolutionary biology, this usually happen when there is a change in environment, new sources of food, new predators or challenges for the species. This result into speciation and changes in the phenotype of organism depending on their adaptive trait. This can be morphological or physiological trait of adaptation. There are 4 features for adaptive radiation, common ancestry, pbenotype to environment correlation, trait utility and speciation.