The energy that's given to the body by food is a. best obtained by eating high protein. b. measured in units called calories. c. excreted by the body if not used. d. a nutrient that's essential for growth and development.

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?

What drives the atp synthase reactions that produce atp

The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?