Since people see best in the yellow-green region of the spectrum, the efficiency of sodium yellow-green lamps that illuminate highways is
A. not affected.
B. higher.
C. lower.
D. misunderstood by experts.
Answer: B
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How deep is the photic layer usually along the coasts?
a. 50 meters b. 100 meters c. 150 meters d. 590 meters
The largest language group of Africa South of the Sahara is the __________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not part of the climate system?
A) biosphere B) gyrosphere C) geosphere D) hydrosphere E) cryosphere
The new IRIS and NCEA programs of the EPA
A) work globally with U.N. agencies to detect pathogens in imported foods. B) write policy for the U.S. Congress to shape legislation on toxic chemicals. C) publish and create databases on chemicals released into the environment that may pose health risks. D) have produced an index for the risk of suffering from asthma in U.S. cities.