How does mRNA help in the differentiation of structures as an organism develops

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

Match the description of each organism to the appropriate category

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?