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Speciation is the evolutionary process by which new species arise from existing populations through the development of reproductive isolation. One of the primary mechanisms is allopatric speciation, which occurs when a population is geographically separated by physical barriers such as mountains, rivers, or oceans. This isolation prevents gene flow, allowing populations _____ ____ _______ __________ _____ _____ _____ _____ ____ __________ ______.
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