Throughout the 3.5 billion year history of life on the earth, there has been a natural, low rate of species extinction known as ____.
A. mass extinction
B. secondary extinction
C. biological extinction
D. background extinction rate
E. tertiary extinction
Answer: D
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The first farming communities were
A. in southwestern Asia B. in Mexico C. in Florida D. in China
The West African country of Togo and the European country of France have approximately the same arithmetic density. From this we can conclude that the two countries have the same
A) level of output per farmer. B) number of people per area of land. C) pressure placed by people on the land to produce food. D) standard of living.
Fair trade returns on average ________ percent to producers rather than 1 percent seen in so many trading arrangements
A) 10 B) 25 C) 33 D) 66 E) 75
Which of the following is true concerning the Saffir-Simpson scale EXCEPT
A. a category 5 hurricane produces more than five times the damage of a category 1 hurricane. B. category 3-5 storms are considered "major" hurricanes. C. a tropical storm becomes a hurricane when winds exceed 119 km/hr (74 mi/hr). D. hurricane Katrina was a category 5 hurricane.