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Speciation occurs during the evolutionary development, or phylogeny, of a species. In which of the following situations can speciation occur?

When a population becomes extinct.
When two populations are reproductively isolated.
When a population becomes interbred.
When two populations merge to become one population.

User Jon Ownbey
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the answer is the second one
User Paulraj
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The said question is asking to choose among the following choices that states the situation that the speciation occur and base on my own research and further investigation, I would say that the answer would be "When two populations are reproductively isolated". I hope you are satisfied with my answer 
User Ravi Shankar
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