The measure of the energy of motion of particles of matter

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

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?

Do plant cells perform cellular respiration?