In some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring cal are sterile but some female ligers are fertile. In the wild, lion and tige unlikely. Furthermore, the solitary behavior of tigers and the social organizations of lion hybrid offspring called "ligers." Male ligers r ranges do not naturally overlap, making such a cross s create behavioral difference Applying the biological species concept, the sterility of ligers reveals that:______

A) tigers and lions are separate species

B) a new species called "ligers" is forming

C) lions are probably a subspecies of tigers

D) tigers and lions are actually the same species