(a) "The process of evolution of different species in a given geographical area starts from a point and literally radiates to other geographical…

This is adaptive radiation leading to divergent evolution.

Example – Many varieties of Darwin’s finches on the same island arose from the original seed-eating finches with altered beaks enabling them to become insectivorous and vegetarian finches / A number of marsupials different from each other evolved from an ancestral stock but all within the Australian island

. (b) • Example-Evolution of Placental mammals and Australian Marsupials or

any other corresponding example of these categories respectively.

• Convergent evolution.