Approximately what percentage of precipitation that falls on the continents runs off the surface via rivers/streams?
A. two-thirds
B. one-third
C. one-tenth
D. nine-tenths
Answer: B
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One advantage of large-scale hydropower is that it
A. does not require government subsidies. B. has a high net energy yield. C. produces low methane emissions. D. makes it easier for fish to migrate upstream. E. does not alter aquatic ecosystems.
A country's fertility rate is NOT decreased by
(1) decreased importance of children in labor force (2) urbanization (3) higher educational opportunities for women (4) reduced cost of raising children (5) lower marriage age
Which of the following is NOT true of plantation agriculture?
A) For many generations, plantations were important in the U.S. South, where the principal crop was cotton, followed by tobacco and sugarcane. B) Plantation farming in the U.S. began to decline after the abolition of slavery C) Today, plantation farms are mostly in developing countries D) Crops they grow help feed about seventy percent of the population in the countries where they are E) They are often owned and managed by Europeans and North Americans
Features that serve the same purpose on very dissimilar organisms are called ____
A)heterologous B)exogenous C)homologous D)analogous E)vestigial