The energetic hypothesis and dynamic stability hypothesis are explanations to account for a) plant defenses against herbivores. b) the length of food chains. c) the evolution of mutualism. d) resource partitioning. e) the competitive exclusion principle.

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Dan made the table shown to describe two different relationships between animals. organism interactions relationship a relationship b one organism lives inside the organism it feeds off no organism is harmed which of the following statements is most likely correct?