Approximately ________% of the fuel you pump into your automobile does something other than move your vehicle down the road
A) 85-90 B) 20-25 C) 35-45 D) 65-75 E) 55-65
A
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Before there were modern humans on Earth (i.e., before 200,000 years ago), how many species became extinct each year? Assume there have always been exactly 10 million species.
A. 10/year B. 1/year C. 100/year D. 1000/year
The speed of travel for radio waves is
A. at a speed that depends on frequency. B. usually at the same speed as sound waves. C. slower, on average, than sound waves. D. always much faster than sound waves.
Which of the following is a correctly balanced equation?
A. 2 P4 + 12 H2 ? 8 PH3 B. P4 + 3 H2 ? PH3 C. 1 P4 + 6 H2 ? 4 PH3 D. 0 P4 + 6 H2 ? 4 PH3 E. P4 + 6 H2 ? 4 PH3
What factor has prevented Caribbean countries from reaping the full benefits of their extensive investment in education?
A) drug trafficking B) the continuing importance of the informal sector C) brain drain D) offshore banking and online gambling E) high levels of illiteracy among Caribbean youth