Distinguish between background extinction andmass extinction. What is the extinction
Chapter 9, Problem 2(choose chapter or problem)
Distinguish between background extinction andmass extinction. What is the extinction rate of aspecies? Describe how scientists estimate extinctionrates. Give four reasons why many extinction expertsbelieve that human activities are now causing a sixthmass extinction. Distinguish between endangeredspecies and threatened species. List some characteristicsthat make some species especially vulnerable toextinction.
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