Suppose the Background Extinction Rate of Amphibians Is 8 Per

question 6

Multiple Choice

Suppose the background extinction rate of amphibians is 8 per 1,000 years and that during the twentieth century, 20 amphibians went extinct. The extinction rate of amphibians is now about how many times the background rate?

• A) 4
• B) 8
• C) 25
• D) 40

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Definitions:

House-Grey Memorandum

Unofficial diplomatic communication in 1916 between the United States and Great Britain outlining a proposal for joint mediation of World War I by the United States, contingent upon support from both the Allies and the Central Powers.

American Neutrality

The policy maintained by the United States at various times, notably during the early years of World War I and II, of not taking sides in conflicts between other nations.

Republican Presidential Candidate

An individual nominated by the Republican Party to compete in the United States presidential election.

Francisco Pancho Villa

A Mexican revolutionary general and one of the most prominent figures of the Mexican Revolution.