One way to describe a species is as a population adapted to a certain niche. That population has a small gene pool. If the members of different species could interbreed with each other, too much genetic variability would occur in that gene pool. Too much genetic variability would

Respuesta :

mean that the off spring may be infertile as the two organisms have become too genetically varied and therefore are different species the infertile offspring would be proof of this . 

Its b: reduce adaptation to the niche