The statement that certain meteorites resemble the composition of the early mantle is
A) a hypothesis.
B) an assumption.
C) a theory.
D) an observation.
Answer: B
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c____________ are generally soft-bodied animals that lack a rigid internal skeleton for the attachment of muscles, but
many possess some sort of hard, protective outer covering. Fill in the blank(s) with the appropriate word(s).
The most abundant zooplankton are copepods
Indicate whether the statement is true or false
Although hydroelectric dams generate electricity without directly producing greenhouse gases, they ________
A) eliminate wildlife habitats and affect the temperature of waterways B) produce as much other air pollutants as coal-fired power plants C) are short-lived structures that have to be rebuilt about every 20 years D) contribute only about 5% of global electricity production
The pattern of absorbance of solar energy by the atmosphere includes
A. absorbance of infrared radiation by carbon dioxide and water vapor. B. a remarkable uniformity in the proportion of different kinds of wavelengths absorbed by ozone. C. heavy absorbance of visible light by carbon dioxide.