Tropical grasslands differ from midlatitude grasslands in that ____
a. the environmental control factor of fire is insignificant
b. savanna grasses are very short
c. tropical grassland includes a scattering of trees
d. tropical grasslands terminate rather abruptly against rain forest
e. the tropical grasslands support grazing animals
c
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Each stage in the process of succession is called a
A. reef-forming stage. B. seral stage. C. primary stage. D. None of these are correct.
What has been the trend in human evolution since the appearance of the Cro-Magnons?
a. Several small subspecies have appeared, acclimated to mini-environments. b. Evolution has proceeded slower than usual. c. Peripheral speciation has resulted in the emergence of the Neanderthals. d. Evolution has become cultural rather than biological. e. Size of organisms has steadily decreased
What creates a moraine?
A) Wave-dominated deltas B) Glaciers C) Atolls D) Tombolos
How much is the legal marijuana market worth in the U.S.?
A) 10.2 million B) 10.2 billion C) 2.7 billion D) 2.7 million E) none of the above