Adaptation is a type of ......

In which geographical region is marsupial radiation observed?

Two organisms occupying a particular geographical area (say desert) show similar adaptive strategies. Taking examples,describe the phenomenon.

Match the following List-$I$ with List-$II$ regarding adaptive radiation in Australian marsupials:

List-$I$	List-$II$
$(a)$ Anteater	$(i)$ Marsupial mouse
$(b)$ Mouse	$(ii)$ Spotted cuscus
$(c)$ Mole	$(iii)$ Marsupial mole
$(d)$ Lemur	$(iv)$ Numbat

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.

Tasmanian wolf and placental wolf appear similar due to