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It is called the speciation process.

If a species is isolated in two different environments, the gene pools of each environment vary, this is known as genetic variation. The environment selects the genes from the gene pool, equipped best for survival. The species with the best genes will live longer and breed more otherwise known as natural selection. This continues until they all have the same genes and become a different type of species as they are no longer able to produce fertile offspring with the other species. This is speciation.

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7y ago

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