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Some scientists claim that amphibians are currently experiencing a period of mass extinction.Which of the following should be included in an alternative hypothesis that would best support this claim?AThe current extinction rate of amphibians compared with the background rate of extinction as determined by the fossil recordBThe extinction rate of amphibians in the 21st21st century compared with the extinction rate of amphibians during the 20th20th centuryCThe number of species of amphibians currently alive compared with the number of amphibian species known to be extinctDThe number of new amphibian species being discovered per year compared with the number of amphibian species becoming extinct during the same time period

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