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As the continents drifted apart, it slowly took the animals with them. Animals became isolated on the large masses of land without control of the climate change. Some continents went to cold areas, some to dry areas and some to tropical areas. As time went by, the animals learned to adapt to the different environments and they multiplied and bred according to what animals survived best in each different type of habitat. Also, because the continents were so far apart, interbreeding became impossible so new species began to appear in each isolated area. This was because both random mutation and natural selection were contained in a smaller space and continued without the genetic influence of other species, which would have caused much less variety. As time went on, new species continued to appear and they became more and more specialized for each new environment.

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