Ways Evolution results in Biodiversity?

Answer 1

If a species is geographically divided over a long period of time (eg by migration or earthquake, river formation etc), it will eventually, if under different adaptive pressures (such as environment, food, competition - Look up Great Rift Valley and Olduvai Gorge) split into different species, which will become genetically or sexually incompatible. These can then split again, given the same geographic isolation etc. Eventually you have many different species, which, while superficially similar, have become diverse in their genetic material. Examples of this include the Cichlids of Lake Tanganyika, Bonobos and Chimpazees, and the Lemurs of Madagascar, in fact humans and all the apes.

Answer 2

it helps species evolve into a well defined status allowing for greater biodiversity.