Darwin's finches discovered from the Galapagos Islands are an example of:

What phenomenon is represented by the flying squirrel and the flying phalanger?

Assertion : Darwin's finches show a variety of beaks suited for eating large seeds,flying insects and cactus seeds.
Reason : Ancestral seed-eating stock of Darwin's finches radiated out from South American mainland to different geographical areas of the Galapagos Islands,where they found competitor-free new habitats.

The evolutionary process that gives rise to new species adapted to new habitats and ways of life is called adaptive radiation. Which of the following is an example of this?

$A$: Spotted cuscus and marsupial mole are examples of marsupial radiation.
$R$: Both are found in the Australian region.

What do Darwin's finches represent?