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(B) The material and cultural wealth of a nation are insignificant when compared with the country's biological wealth.
(C) The enormous diversity of life on Earth could not have come about without periodic extinctions that have conferred preeminence on one species at the expense of another.
(D) The human species is in the process of initiating a massive extinction episodes look minor by comparison.
(E) The current decline in species diversity is human-induced tragedy of incalculable proportions that has potentially grave consequences for the human species.
8. Which one of the following situations is most analogous to the history of global diversity summarized in lines 10-18 of the passage?
(A) The number of fish in a lake declines abruptly as a result of water pollution. Then makes a slow comeback after cleanup efforts and the passage of ordinances against dumping.
(B) The concentration of chlorine in the water supply of large city fluctuates widely before stabilizing at a constant and safe level.
(C) An old-fashioned article of clothing goes in and out of style periodically as a result of features in fashion magazines and the popularity of certain period films.
(D) After valuable mineral deposits are discovered, the population of a geographic region booms then levels off an d begins to decrease at a slow and steady race.
(E) The variety of styles stocked by a shoe store increases rapidly after the store opens, holds constant for many months, and then gradually creeps upward.
9. The author suggests which one of the following about the Cretaceous crisis?
(A) It was the second most devastating extinction episode in history.
(B) It was the most devastating extinction episode up un until that time.
(C) It was less devastating to species diversity than is the current biodiversity crisis.
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