Which statement best describes how a catalyst can speed up a chemical reaction? the catalyst makes lower energy pathways available. the catalyst increases the concentration of products. the catalyst binds to enzymes to release substrates. the catalyst increases the concentration of reactants

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?