Aplanet has an average distance to the sun of 4.54 au. in two or more complete sentences, explain how to calculate the orbital period of the planet and calculate it.

ecotourism pay for conservation efforts.

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.