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The process of evolution of different species in a given geographical habitat starting from a point and radiating to other geographical areas (habitats) is called adaptive radiation.

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When more than one adaptive radiation appeared to have performed in an isolated geographical area that is representing different habitats, is known as convergent evolution.

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Placental mammals that are present in Australia also exhibit adaptive radiation in evolving into varieties of such placental mammals each of which appears to be ‘similar’ to a corresponding marsupials.