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? A. The current extinction rate of amphibians compared with the background rate of extinction as determined by the fossil record
B. The extinction rate of amphibians in the 21st century compared with the extinction rate of amphibians during the 20th century
C. The number of species of amphibians currently alive compared with the number of amphibian species known to be extinct
D. The number of new amphibian species being discovered per year compared with the number of amphibian species becoming extinct during the same time period

Amphibians are the organism that can lives in both water and land. They can be identified by these characters: cold-blooded and moist skin.

The best hypothesis to support the claim is:

(B) Comparison of the extinction rate of amphibians in the 21st century  with the extinction rate of amphibians during the 20th century.

Thus, If we compare the extinction rate of 20th century to the 21st that is current period we can calculate the number of extinction.

The option (b) The extinction rate of amphibians in the 21st century compared with the extinction rate of amphibians during the 20th century is correct.

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B. The extinction rate of amphibians in the 21st century compared with the extinction rate of amphibians during the 20th century.

Explanation:

Some scientists claim that amphibians are currently experiencing a period of mass extinction due to climate change which can be explained and recorded by recording the extinction rate of amphibians in the 21st century as compared to the extinction rate of amphibians during the 20th century which provides us a lot of information about the mass extinction of different species..

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