Where Is Macro-Evolution Occurring

That seems a wierd way to look at it Ned. Considering the nature of many of the best known examples Darwin studied, differing species on islands in a chain, it seems pretty obvious why he would consider geographic isolation to be a significant factor. To see how non-surprising it is you only have to notice the Alfred Russel Wallace reached the same conclusions after his studies in the Malay archipelago.It is also worth noting that geographic isolation is not neccessarily required for evolution to occur. There is a PNAS review of an article on sympatric evolution in Drosophila which discusses the the differing possible mechanisms of speciation.

Careful what you say, Syamsu will be in here next thing critiquing the comparison of european and african and showing how it demonstrates Darwinism's fundamental complicity in eugenics and racism.