Acertain species of salamander was split into two populations by a wide, dry valley, and the populations?
and the populations began to diverge from each other. after a period of time, some members of the two populations began to interbreed in a hybrid zone at the southern end of the valley. only weak reproductive barriers existed by this time, so the two populations could freely interbreed and re-establish gene flow. this outcome in a hybrid zone is known as 1)speciation 2)reinforcement 3)fusion 4)punctuated equilibrium 5)stability