The Rocky Mountains are known for beautiful scenery. Which processes of the Rocky Mountains most likely required the longest period of time to occur? growth of plants and trees

formation of valleys from glaciers

large uplift of the land from tectonic forces

large accumulation of snow on the mountaintops

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

Which beat describes the brain stem

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?