When moving upward on an energy pyramid from one level to the next, what happens to the usable energy in an ecosystem? it increases by about 10%. it increases by about 90%. it decreases by about 10%. it decreases by about 90%.

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.

What type of cell division is used to replace old cell?

If a keystone species is removed from an ecosystem