What's another trait about you that you think DNA played a part in? Does teeth count? Help pls

Galaxy whose shape seems different follow no set pattern are classified as

What must be true for natural selection to heppen

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?