What is a feature of r-selected species?
A. Their offspring mature slowly.
B. They have long life spans.
C. They have populations that fluctuate between high and low.
D. They breed late in life.
E. They have only one or two offspring.
Answer: C
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According to the 1986 Immigration Reform and Control Act, undocumented immigrants were
A) permitted to become legal residents by participating in an application process. B) automatically transformed into U.S. citizens in a blanket "amnesty." C) encouraged to remain in Mexico because of shortages of workers. D) no longer eligible for public services in the United States. E) established as guest workers following the German model.
Plate tectonics (continental drift):
A) is probably responsible for some climatic changes that occur on a time scale of thousands of years. B) may be a key factor in explaining the cooling trend since the 1940s. C) may help us better understand the cause of the Ice Age.
The world's desert regions:
a. have always had arid climates. b. are 99 percent covered by active sand dunes. c. are fragile environments. d. have no vegetation. e. have no relief.
According to the demographic transition, death rates first begin to fall in
A. Stage 1 B. Stage 2 C. Stage 3 D. Stage 4