Which of the following characterizes the pesticide DDT and industrial chemicals such as PCBs?
A) Persistence in the environment
B) Biologically active
C) Relatively high toxicity
D) Propensity to accumulate in food chains
E) All of the above are correct.
E
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These two conditions, working together, will make the atmosphere the most unstable
A) warm the surface and warm the air aloft B) cool the surface and cool the air aloft C) warm the surface and cool the air aloft D) cool the surface and warm the air aloft
Given the three molecules 1-methylcyclohexanol, trans-2-methylcyclohexanol, and trans-4-methylcyclohexanol, which of the following statements is true?
A) All three molecules are chiral. B) Only 1-methylcyclohexanol and trans-2-methylcyclohexanol are chiral. C) Only trans-2-methylcyclohexanol is chiral. D) Only trans-2-methylcyclohexanol and trans-4-methylcyclohexanol are chiral.
Which of the following might correspond to the O2 pressure in a hyperbaric chamber?
A) 160 torr B) 760 torr C) 1600 torr D) none of these
A pass formed when headward erosion causes two cirques to intersect, producing a low saddle in a high mountain ridge, is termed a(n) _______________
Fill in the blank(s) with correct word