If the bright lines in the spectrum of oxygen are matched by lines in the dark-line spectrum of the sun, what does that indicate?

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.

b - the respond is innate and varies over time.

good luck!