The origins of 300 or more species of cichlid fish in Lake Malawi can best be explained by

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The origins of the diverse species of cichlid fish in Lake Malawi are best explained by adaptive radiation, a process where organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches.

The Origins of 300 or More Species of Cichlid Fish