Researchers suggest that the challenge to the theory should encourage biologists to reexamine the evolution of many species of birds, mammals, insects and others thought to have arisen due to the period of glaciation from 2 million to 10,000 years ago. It also suggests that researchers may have to rethink the origins of other species that have been explained by other well-entrenched theories. There wasn't any way to get at them. Now we have some of the tools to do that. It's not going to be easy to look that much farther back in geologic time and figure out why these populations got isolated.
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