Shifting cultivation is most commonly practiced in
A) core countries.
B) tropical and subtropical regions.
C) southern Africa and Australia.
D) Siberia.
Answer: B
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When did the continents acquire outlines similar to the ones they have now?
A) Cenozoic Era B) Paleozoic Era C) Mesozoic Era D) Devonian Period
Examine the map of the plate boundaries and answer this question.
A major transform plate boundary is present at ________.
A. A B. B C. C D. D E. E
Which of the following oxidizing agents oxidizes aldehydes in the body?
A) NADH B) NAD+ C) O2 D) none of these
Physical methods for detoxifying hazardous wastes include
A. filtering with charcoal or resins to remove harmful solids. B. isolating the materials and placing them in safe storage. C. destroying toxic substances with bacteria and enzymes. D. activating chemical reactions to convert hazardous chemicals into harmless ones. E. using deep-well disposal.