Suppose you are studying a new population of rock pocket mice in Arizona, where there are no visual predators. These mice live on a recently discovered patch of dark-colored volcanic rock. This environment does not have nearly as many visual predators as in previously studied areas in New Mexico. You observed the following numbers of light-and-dark mice on this new patch of rock. A. What explains the fact that the numbers don't change very much?
B. What explains the fact that the numbers change at all, and don't stay perfectly constant? Answer in one word .