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Which clue indicates that a speciation has occurred between two populations? A. Two different looking individuals are within the same population. B. Interbreeding between two populations is impossible. C. A physical barrier such as a mountain range separates a population. D. Renaming of a population has been complete by scientists.

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Definitely C, as example, there was one big population of squirrels, then the grand canyon formed a barrier and the squirrels adapted to the different parts, and they adapted into whole new species entirely
User Jonathan Ramos
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