Which of the following is not characteristic of facilitated diffusion? A It moves substances against a concentration gradient. B It requires a carrier protein. C It involves a change in the shape of its carrier. D It requires no energy input.

the correct answer is A

Explanation:

faclitated diffusion takes place down the concentration gradient

i think the answer is b.

hope it

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.