What type of muscle is responsible for contractions of the digestive tract and arteries? what type of muscle is responsible for contractions of the digestive tract and arteries? smooth muscle skeletal muscle striated muscle voluntary muscle cardiac muscle?

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.

c should be the answer

its b. greenhouse gasses trap uv rays for heat so that the plants stay alive.