Which of the following statements regarding variations in Earth's orbit is true?
A. their combined effect on past global temperatures is purely hypothetical.
B. even together, they don't produce enough temperature change to cause an ice age.
C. they can fully account for the recent rise in global temperature.
D. their effect on global temperatures was only recently discovered by NASA scientists.
E. all of the answers listed here.
Answer: B
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Why are plants a good source of potential drug compounds?
A. because natural products are much more effective than synthetic products B. because it is far cheaper to grow chemical compounds in a plant than it is to synthesize them in the laboratory C. because there are thousands of different plants with thousands of different chemicals in them D. all of the above E. none of the above
Japan is bordered on the southeast by a back-arc basin. Indicate whether the statement is true or false
Swell is more regular than waves in the wind-generated area because ________.
A. packets of swell are all at the same depth at the same time B. waves have been sorted by dispersion C. waves have been sorted by dispersion and some small waves have been damped out by friction D. some small waves have been damped out by friction E. waves have been sorted by dispersion, some small waves have been damped out by friction, and packets of swell are all at the same depth at the same time
The distribution of benthic biomass closely matches the distribution of ________ in surface waters
A) carbonic acid B) chlorophyll C) density D) salinity E) temperature