Which is a physical characteristic of a cat?
O feathers
O fur
O fins
O wings

fur

Explanation:

Have you seen a cat? It don't have feathers or wings because it's not a bird. It doesn't have fins because it's not a fish.

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.

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