What is the most important pre-condition for adaptive radiation?

The process of evolution of different species in a given geographical area starting from a point and radiating to other geographical areas is called .........

Marsupials and Australian placental mammals exhibit convergent evolution. Explain how?

What is adaptive radiation? Describe its types.

Darwin's finches are an example of which phenomenon?

$A$: Placental wolf and Tasmanian wolf (a marsupial) show convergent evolution.
$R$: Like marsupials,placental mammals in other parts of the world also exhibit adaptive radiation in evolving into varieties of such placental mammals,each of which appears to be similar to a corresponding marsupial.