How does geologic isolation provide evidence of evolution?

Answer 1

Contrasting creationism and evolution.

If creationism is correct, all living species were preserved on the ark during the flood, and, on release, would have radiated from the place of the ark's landing.

So we should see a progression across the world from the middle east - it's possible that fast-moving animals made it to Australia, America and Asia in the few thousand years since the flood. Slow-moving and sedentary creatures (think of sloths and earthworms, for instance) would be found closer to the middle east.

But this is not so. Australia is the *only* place you'll find marsupial macropods (wallabies, kangaroos) and the platypus. You will find echidnas in PNG as well as Australia. Since these species are not found nearer to the Middle East (neither living nor fossil), the post-diluvian radiation is shown to be false.

Now, if post-diluvian radiation is false, then the alternative - evolution by natural selection - becomes the most plausible remaining explanation for the dispersion of particular groups of species, such as the macropods and monotremes.

Creationism is further counfounded by pathogens. Remember that *all* creatures not on the ark were drowned. Their pathogens (lice, worms, bacteria, viruses) would also have persished.

Since we do still have lice, worms, bacteria and viruses, these must have been carried by their preferred hosts on the ark. Given the rapid death that follows infection by any number of deadly human diseases, how come *anyone* survived while carrying bubonic plague, typhoid, cholera, etc. And if God immunised Noah and his family against these pathogens, where did our immunity vanish to?

Answer 2

It is when all the land was once togather now its apart and some of the species that lived on land that turn out to becoming an island its species went along to it.

Answer 3

It does not. Geographical isolation may be instrumental in providing reproductive isolation. Reproductive isolation is a cause of speciation.