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But it is these small changes that eventually add up to a big change. A little change here, a little change there over time becomes a whole new species. I'm sure a deer-like creature has a biological requirement to become a whale. If it did it would probably be hunted before it could establish itself or be outcompeted by the whales and dolfins already out-there. The point of Macroevolution is that it is Microevolution on a grander species crossing scale.
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