Time delays can allow an environmental problem to build slowly until it reaches a(n) ____, which causes an often irreversible shift in the behavior of a natural system.
A. sustainable yield.
B. ecological tipping point.
C. exponential growth
D. ecological footprint.
E. environmental worldview.
Answer: B
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A threatened species ____.
A. may soon become extinct over all or most of its range B. is one that is evolving into another species C. is one that is likely to become endangered D. is thought to be endangered, but the data is inconclusive E. may be considered economically important but rare
Which of the following is true of the glycosidic bonds in heparin?
A) They are all a(1 ? 4). B) They are all b(1 ? 4). C) The a(1 ? 4 ) and b(1 ? 4)bonds alternate. D) None of the above is true.
After the collapse of the USSR Russian leaders tried to reverse socialism rapidly, through what they called "__________," which they knew would be painful but hoped would be brief.
a. market transition b. perestroika c. glasnot d. shock therapy e. collectivization
Because whales are homeotherms, individuals of a single species can migrate between and survive in waters of very different temperatures.
Answer the following statement true (T) or false (F)