What drives most of the water within xylem vessels to move toward the top of a tree? a. the force of root pressure b. atmospheric pressure on roots c. active transport of ions into the stele d. evaporation of water through stoma e. osmosis in the root?

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?