, harmful or helpful is considered to be the source for new alleles and a main contributor to the diversity of life.
A) Mitosis
B) Mutations
C) Transcription (which was already marked as an incorrect answer
D) Translation

The answer will be Mutations.

Explanation:

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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.

amber has allowed scientists to study dna that has been preserved over millions of years.