What type of bond is formed when oxygen combines with hydrogen to form water A. Ionic
B. Peptide
C. Hydrogen
D. Polar Covalent
E. Nonpolar Convalent

Option D is the correct answer of this question

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.

b - the respond is innate and varies over time.

good luck!