Which statement provides the best description of the relationship between primary consumers and producers?
A. Primary consumers provide producers with the chemical energy
they need
B. Primary consumers eat secondary consumers, which rely on
producers for food.
C. Producers and primary consumers compete with each other for
food sources.
D. Producers provide primary consumers with the chemical energy
they need
SUBMIT

What is a difference between systemic and pulmonary circulation? a. systemic circulation carries oxygenated blood to the lungs and pulmonary circulation carries deoxygenated blood to the body. b. systemic circulation carries deoxygenated blood to the lungs and pulmonary circulation carries oxygenated blood to the body. c. systemic circulation carries deoxygenated blood to the body and pulmonary circulation carries oxygenated blood to the lungs. d. systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.