quote:
I will very politely disagree. What needs to be conveyed to creationists is that speciation is a matter of genetics. If two new populations do not mingle DNA, then different mutations will accrue in each population. Over time, this will lead to greater morphological differences and eventually to a physical barrier that prevents interbreeding. Evolution requires that, for biodiversity to appear, there has to be a process that separates genomes. Speciation is that method.
JM: Physical separation is a very powerful way to isolate populations (Madagascar, Australia, opening of the Atlantic ocean etc).
Cheers
Joe Meert