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For two populations to evolve into two species that look different, what must happen?

User Tilex
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A form of speciation, whether it is allopatric speciation, which is the separation of a population by a physical barrier i.e. a dam wall, or sympatric speciation, which is the separation of a population but not by physical barriers, needs to happen for a population to evolve into different species
User Mohammad Roshani
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