Question

What process accounts for species diversity?

Answer 1

http://en.m.wikipedia.org/wiki/Species_diversity

This should help, don't have to read it all.

Answer 2

Attribute it to 'phylogenesis' or speciation (going from 1 species to 2) natural selection or Evolution. Take a look at some videos that discuss:
biodiversity
speciation
extinction
Charles Darwin & evolution

I've also included a picture illustrating the speciation and extinction of dinosaurs common to the Triassic, Jurassic and Cretaceous periods - remember the Triassic Period is stated of have lasted over 200 million years. I've also included a mammal tree too because it was hard to find an appropriate picture to illustrate this 'process'. Continue discussion.

Answer 3

Darwin’s Theory of Evolution, natural selection, and Artificial selection

Answer 4

@bringmehtheunicorns

Answer 5

Darwin’s theory supports natural selection, so all in all, it is both Artificial and natural selection that account for species diversity