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The simplest method would be geographic separation of the species, allopactric speciation. The local population of this species is split asunder by some geographic barrier; perhaps a large number of the species, about half, cross a river and take up new territory there. Then the similar population gene pools start to draw apart as different mutations to the DNA and different selection pressures in the new environment shape the across the river species into a new species over time. Long enough and the two split species can not longer, or do not want to, interbreed.

This is how bonobos became a new species from common chimpanzees.

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12y ago

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