Which of the following statements is true regarding the immune system?

a) too many t cells can interfere with proper immune system functioning.

b) the higher the antigen level, the better health the individual enjoys.

c) lymphocytes are made up of antibodies and antigens.

d) b cells produce antibodies that serve to destroy foreign cells in the body.

What fraction of high school seniors in the united states admit to drinking alcohol

Suppose you calculate that elasticity of demand for cigarettes is 0.5. you can conclude that: a. demand for cigarettes is elastic b. demand for cigarettes is unitary elastic c. a 1% increase in price of cigarettes will result in a 0.5% decrease in quantity demanded d. a 1% increase in the price of cigarettes will result in a 0.5% increase in quantity demanded.

Which action occurs in the third stage of cell division? a. the nuclear material of cell is copied exactly. b. the nuclear membrane disappears. c. the cell forms two nuclei d. the nuclear material separates, with half moving to either side of the cell.