Fossil fuels have been used for years as a source of energy. even though there are many negative issues associated with the use of fossil fuels, they continuw to be used at a great extent. this is

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?