* Question Completion Status: באוטו ונפטצ
Based on what researchers have learned about the environment and
O Brain development will slow down,
O Cognitive development will slow down.
Both brain and cognitive development will slow down.
O Neither braln nor cognitive development will slow down.

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.