Based on the description of a dose-response curveĀ given in the text, you would expect the curve for arsenic

A. would show that arsenic is beneficial to humans when consumed in low quantities, but toxic at high quantities.
B. was a major factor in setting the new, lower drinking-water standard for dissolved arsenic of 10 ppb in public water supplies.
C. would show that microorganisms can be very helpful in decontaminating a site with high arsenic levels.
D. would show no benefit to low concentrations and great harm from high concentrations.


Answer: D

Environmental & Atmospheric Sciences

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