Two Species Regularly Come into Contact and Form Hybrids That

Multiple Choice

Two species regularly come into contact and form hybrids that have higher fitness than either of the parental species. What are the possible consequences of regular hybridization between these species? Check all that apply.

A) evolution of a third species
B) reinforcement of prezygotic isolating mechanisms
C) extinction of the parental species
D) increased gene flow between the parental species