Utilizing ultisols for agriculture requires a. extensive irrigation b. fertilizer to balance the high alkalinity of the soil c. adding organic matter to supplement the shallow horizons d. fertilizer to replace nutrients that leach from the soil

Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. oxygen will diffuse more quickly into cell because . b the oxygen molecules inside cell b have a higher kinetic energy b. a its membrane transport proteins will not be saturated c. a the diffusion gradient there is shallowerd. b the diffusion gradient there is steeper