Which of the following compounds is a natural ripening agent for fruits?
A) ethane
B) ethylene
C) acetylene
D) none of these
B
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Which of the following explains how fog is a problem to aviation?
A. visibility drops B. visibility increases C. temperature increases D. temperature decreases
Current flow direction can be determined by cross-beds and ripple marks. Indicate whether the statement is true or false
In the United States, public transportation systems are
A) profitable. B) breaking even. C) operating at a loss. D) as extensive as those in Europe. E) changing the U.S. car culture.
Prescribed burns would be used in forests ________
A) where there high densities of endangered species, such as tropical rainforests B) plagued with insects as a cheaper alternative to pesticides C) that have heavy recreational use to warn people about the dangers of fires D) that are subject to severe wildfires to remove fuel load and stimulate new growth E) to convert primary forests into secondary forests