1.
(ENZYME) recognizes start of a gene and begins to
the segment of DNA.

RNA polymerase recognizes start of a gene and begins to catalyze the segment of DNA

Explanation:

To start transcribing a gene, RNA polymerase attaches to the gene's DNA at a region known as the promoter. The promoter basically instructs the polymerase where to "sit down" on the DNA and start transcribing

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.