A severe storm forms a new rive that divides a population of mice. After 500 years, a drought causes the rive to dry up, allowing the two populations of mice to mix. Mating between mice from the two populations does not yield any offspring. This is an example of
A. hybridization
B. adaptive radiation
C. balanced polymorphism
D. sympatric speciation
E. allopatric speciation
Answer: E. allopatric speciation