Question

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.

Answer 1

the answer is the second one

Answer 2

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