51. Hemoglobin delivers O2 to body cells from the red blood cells a. until the hemoglobin is depleted of O2. b. until the partial pressures of O2 in the two different cells are equivalent. c. although the hemoglobin is never completely saturated. d. by releasing O2 to cells with a higher partial pressure of oxygen. e. until the fluid pressure in the red blood cells is lower.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

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