Opportunistic bacteria a. replicate inside host cells b. only cause infection in certain situations c. are larger than normal bacteria d. are primarily found in damp environments

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.

its temperature is increasing. this causes molecular vibrations to increase.