Which term describes the chromosomal abnormality of having three copies of a single chromosome

Trisomy

Explanation:

Trisomy is the presence of three copies of one chromosome instead of the normal two. Trisomy usually causes some anomaly such as Patau Syndrome, Edwards Syndrome or Down Syndrome. Many trisomies cause early deaths, but with the advancement of technology and medical treatment, this problem of early death has become ever smaller.

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.