Which structure evolved in finches, allowing them to become insectivorous and vegetarian?

Select the $CORRECT$ statement.

Which of these is $NOT$ an example of adaptive radiation?

Explain the interpretation of Charles Darwin when he observed a variety of small black birds on the Galapagos Islands.

Marsupials are found in:

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.