Uplift and formation of a mountain range divides a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of:.a) allopatric speciation. b) diversifying speciation. c) incomplete speciation. d) punctuated equilibrium. e) sympatric speciation.