In the Rocky Mountains, one species of chipmunk, Eutamias umbrinus, lives in coniferous forests at high elevations and a second species, E. dorsalis, lives in open woodlands at lower elevations. They meet at the transition between the habitats, but overlap very little. Propose two alternative hypotheses that could explain why E. umbrinus does not live at lower elevations. Describe the experiments you would carry out to test each of these hypotheses. Discuss the possible results of each experiment and how they would support or contradict each hypothesis.