Kangaroo rats, kangaroo mice, and pocket mice are found only in the deserts of the Southwestern United States. They share a number of features, including external, fur-lined cheek pouches, which they use to gather and transport seeds to their burrows. But they are also quite different from one another in size, overall shape, behavior, and other features. The best explanation for their similarities and differences is that A. the species are not closely related evolutionarily and that any similarity is due to the fact that they live in similar environments. B. the desert environment forced each species to develop traits allowing it to survive and reproduce. Each species represents a different way in which a small mammal can survive and reproduce in the desert. C. the species share a common ancestor (one that had, among other traits, external fur-lined cheek pouches), and natural selection has resulted in each having specific adaptations for its own environment. D. natural selection has resulted in each species having specific adaptations to its own environment, but the species do not share a common ancestor. E. None of the above.