Which statement describes an important role of carbon dioxide in earth's atmosphere?
animals breathe carbon dioxide.
plants use carbon dioxide to make food.
carbon dioxide animals make proteins.
carbon dioxide forms clouds that produce rain.

Plants use carbon dioxide to make food

Explanation:

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explanation:

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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.