The pressure in the center of a tornado is:
a. often more than 100 mb lower than that of its surroundings
b. about 5 mb higher than that of its surroundings.
c. about 5 mb lower than that of its surroundings.
d. roughly the same as that of its surroundings.
a
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The introduction of exotic species into a freshwater ecosystem generally increases the population of the native species.
Answer the following statement true (T) or false (F)
Which of the following explains the insolubility of lipids in water?
A) Lipids are polar molecules. B) The polar portion of lipids is much larger than the nonpolar portion. C) The polar portion of lipids is much smaller than the nonpolar portion. D) The polar and nonpolar portions of lipids are of comparable size.
Which of the following is NOT one of the four major divisions or subregions of the United States region?
a. West b. Midwest c. South d. Northeast e. Pacific
The key idea behind the scientific method is
A) the use of intuition in testing theories. B) unbridled speculation about the world. C) an appeal to supernatural explanations when natural explanations have not yet been found for a phenomenon. D) the testing of ideas through controlled observations and experiments.