Two populations of organisms belong to the same biological species when they

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The biological species concept defines a species as a group of individuals that can interbreed and produce viable, fertile offspring in nature. This means that two populations must be able to mate and produce viable offspring in order to be considered members of the same biological species. A is incorrect because if organisms cannot mate due to differences in mating times then they are not even attempting to interbreed, rendering the concept of species irrelevant. C is incorrect because even if members of different populations use different methods to attract mates, they may still be able to mate and produce viable offspring. D is incorrect because although anatomical differences may make mating more difficult, they do not necessarily prevent it entirely.

Two Populations of Organisms Belong to the Same Biological Species