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How Amphibians crossed continents

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''There are nearly 7,000 known species of amphibians, but for the first time scientists have attempted to figure out how some of these types managed to cross continents throughout time.

Using DNA sequence data, researchers at the George Washington University pieced together the 300-million-year-old storyline of amphibians such as frogs, toads, salamanders and caecilians...''

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