What happens to us when one of our bones brake?

explanation:

within a few hours of your bone breaking, the body forms a clot around the break. immune system cells in the blood clot get rid of germs that may have entered. cells called chondroblasts create a soft collagen callus around the break and a hard callus eventually replaces the soft callus, creating new bone.

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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