Dinosaurs and large mammals coexisted during the Mesozoic era
Indicate whether this statement is true or false.
Answer: FALSE
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What percentage of its energy needs does the United States import each year?
A) more than 90 percent B) about 70 percent C) about 50 percent D) about 33 percent E) about 20 percent
What is the principal cause of soil erosion?
A. activities of animals B. wind C. running water
Worldwide, the fastest growing cities today are mostly ________
A) the megacities such as Tokyo, Mexico City, and New York City B) in developing nations, such as Delhi, India C) small cities in the southern United States, such as Austin, Texas, and Raleigh, North Carolina D) in the northern United States, such as Chicago, Illinois, and Portland, Oregon E) large cities worldwide, such as Paris, London, and Los Angeles
Light travels at a speed of approximately
A) 340.29 meters per second (1,116.44 feet per second) B) 80,500 kilometers per hour (50,000 mph). C) 1,000,000 kilometers per second (621,371 miles per second). D) 150,000 kilometers per hour (93,206 mph). E) 300,000 kilometers per second (186,333 miles per second).