In the stable food chain shown below, what would you expect to happen initially if you were to suddenly double the population of rabbits? A food pyramid, top to bottom: hawk, snakes, rabbits. a. The populations of the other three species would also increase. b. The populations of the other three species would decrease. c. The grass population would decrease. The snake population and hawk population would increase. d. The grass population and hawk population would decrease. The snake population would increase.

Apopulation of deer mice was introduced into a desert ecosystem. being dark-colored, the deer mice stood out in the sand and were easy prey for predators. over a few years, the color of the mice changed from dark brown to light brown. what role does natural selection play in this example? a. the change of color camouflaged them, which them hunt better. b. the change of color enabled them to regulate their body temperature. c. the change of color allowed them to hide better from predators. d. the change of color made their bodies tolerant to the harsh desert sand. e. the change of color allowed them to deflect the excessive heat.