Acid precipitation
A. has been significantly reduced in the United States.
B. impairs the ability of aquatic organisms to get calcium for skeleton production.
C. affects aquatic ecosystems by lowering the pH of the water.
D. All options are correct.
Answer: D
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Which is better for you: a drug that is a natural product or one that is synthetic?
A) Whether a drug is good for you does not depend upon whether the drug occurs naturally or was synthesized in the laboratory. B) Synthetic products are generally better for you because they lack impurities that could bring on side-effects. C) Drugs extracted from natural products are invariably better for you. D) Drugs extracted from natural products are better except in the case where the synthetic drug is a replica of the drug found in nature.
The Industrial Revolution resulted in economies that were based less on ________ and ever more ________
A) wealth; impoverished B) urban areas; rural C) agriculture; urban D) slavery; on freedom
A desert consisting of a large area of sand dunes is termed a(n) ________
A) reg B) erg C) arroyo D) wadi E) salina
The weather in the United States is dominated by air masses that form over the Arctic Ocean.
Answer the following statement true (T) or false (F)