One way that mass is conserved in biological systems is that the products of photosynthesis are the reactants of cellular respiration.
Which of the following is a product of photosynthesis, but a reactant of cellular respiration?
A. Energy
B. Sunlight
C. Carbon dioxide
D. Oxygen

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.