A ________ is a well-tested and widely accepted view that best explains certain scientific observations.
A. theory
B. law
C. generalization
D. hypothesis
Answer: A. theory
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Which of the following statements is false?
a. The top of the groundwater zone is the water table. b. The recharge of aquifers below cities is very efficient because of storm drains. c. In the zone of saturation, spaces in rock and soil are completely filled with water. d. Rivers of underground water are sometimes found in caverns in aquifers. e. More than one of these choices is false.
RNA and DNA differ in all of the following except:
A. RNA uses a different sugar from DNA. B. RNA uses four nitrogenous bases not found in DNA. C. RNA uses the nitrogenous base uracil (U) in place of thymine (T). D. RNA is single-stranded rather than double-stranded.
What is the name for the following polyatomic ion? CH3CO2-1
A) acetate B) monocarboxylate C) carboxylic D) acidic E) acetic
An explanation for Sub-Saharan Africa's relatively poor soils is
A) that most of the region's soils are old. B) the lack of alluvial lowlands. C) the extensive glaciation of the continent during the last ice age. D) that the soils that are old and the lack of alluvial lowlands. E) the lack of extensive glaciation and older soils.