How are bacteria beneficial to the body? a. they provide us with needed nutrients c. they invade sterile regions in our body b. they form biofilms d. they fight the immune system

they provide us with our needed nutrients (A)

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.