1.

Carbon dioxide is one of the gases that cause the _________._x005F_x000D_

A. greenhouse effect_x005F_x000D_
B. ozonification_x005F_x000D_
C. oven phenomenon_x005F_x000D_
D. sunburn_x005F_x000D_
Answer» B. ozonification_x005F_x000D_


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