Cigarette smoking predisposes a person to frostbite because it:
A) causes arteriolar constriction.
B) decreases the blood pressure.
C) causes peripheral vasodilation.
D) increases peripheral blood flow.
Answer: A) causes arteriolar constriction.
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Water covers about ____% of the Earth's surface
a. 51 b. 61 c. 71 d. 81 e. 91
Ice ages
A) have not occurred for several million years. B) have not affected North America. C) have been more severe because of plate tectonics. D) are more severe when the continents are closer to the equator. E) all of the above
How old are the oldest sediments that have been recovered by deep-sea drilling? Are they younger or older than the oldest continental rocks?
a. The oldest ocean sediments are 180 million years old and are older than the oldest continental rocks on Earth. b. The oldest ocean sediments are 180 million years old and are younger than the oldest continental rocks on Earth. c. The oldest ocean sediments are 4 billion years old and are the same age as the oldest continental rocks on Earth. d. The oldest ocean sediments are 4 billion years old and are younger than the oldest continental rocks on Earth. e. The oldest ocean sediments are 4 billion years old and are older than the oldest continental rocks on Earth.
What was "The Demographic Collapse" in Latin America?
A) the result of epidemics of diseases introduced by the Europeans B) a decline already in progress when the Europeans arrived C) the result of the high rates of internal migration after WW II D) the transition from high growth to low growth through birth control E) the result of civil wars prevalent during the 19th century