Which of the following significantly improved air quality in the United States?
A. The elimination of chlorofluorocarbons.
B. Eliminating lead in paint.
C. The use of catalytic converters.
D. All these statements are correct.
E. None of these statements are correct.
Answer: C
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Genetically modified crops
A. have been shown, in multiple studies, to be dangerous to eat. B. are advantageous for farmers because the seeds are inexpensive. C. cannot transfer their genes to other species. D. have contaminated traditional seed supplies with their genes.
Which feature on this figure is formed by the melting of the mantle above the slab?
A) A
B) B
C) C
D) D
E) E
Acetylation of histones occurs at which residues of the protein?
A) cysteine B) histidine C) lysine D) phenylalanine
The A climate zone is considered "summerless".
Indicate whether the statement is true or false.