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Not sure what you mean by a protected environment David, is that pre-human, eg Africa and South America seperating, or present times? With the former, there have been many differences and visible proof, even today, but to a lesser extent, (us again?). But this goes for worldwide as well. Mountain chains, oceans have all created protected environments, and thus created a great diversity of variation to species. Our species has spread to the whole globe, creating many different races, and different characteristics. Not sure what the jurassic park bit is. Galapagos is a unique example in it`s own right.