Problem: Over a period of five years, researchers studied a population of mice. The fur color of some of the mice was dark fur, while others had light fur. Between years three and five, the researchers recorded a change in the frequencies of the alleles governing fur color. What could have caused this change? Need Assignment Help? Group of answer choices An environmental change that increased the relative fitness of mice with a certain fur color. [ Choose ] The large size of the mouse population. [ Choose ] Migration of mice from a different area into the population being studied. [ Choose ] An increase in the food supply available to the mice. [ Choose ]