One of the most common times to experience a thunderstorm in parts of Iowa and Missouri is between ____ and ____
a. early morning; noon
b. noon; late afternoon
c. midnight; dawn
d. late afternoon; evening
e. evening; midnight
ANSWER: c
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A difference between the innate immune system and the acquired immune system is
A) the innate immune system includes many more different types of receptors than the acquired immune system. B) the innate immune response is immediate, whereas the acquired immune response is delayed, peaking about 3 to 5 days after exposure. C) the innate immune system retains a memory for past exposure, with subsequent responses being faster and more aggressive; the acquired immune system does not. D) each acquired immune system cell responds to a greater number of different pathogens than each innate immune system cell.
If P and S waves were to travel at the same constant speeds, what could be inferred about the Earth's interior?
A) The interior is density stratified. B) The interior is liquid. C) The interior is homogenous. D) None of these choices
What was not an invention rendered by the Chinese to facilitate their ocean voyages?
a. Central rudder system b. Watertight compartments c. Chronometer d. Compass
Curitiba, Brazil, has shown us that ________
A) traffic flows smoothly once pedestrians and bicycles are eliminated B) once roads are widened, traffic congestion decreases C) unregulated urban sprawl produces severe air pollution D) an expanded bus system, affordable to all, can solve a large city's traffic congestion E) prohibition of all motorized vehicles within cities reduces pollution and saves energy