Question

What is evidence for scientists of periods of mass extinction?

A. physical evidence of a change in climate on at least two continents

B. the disappearance of organisms from the geologic record

C. a change in water levels

D. continental drift

Answer 1

Answer is B - the disappearance of organisms from the geologic record.

Answer 2

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Step-by-step explanation:

Mass extinctions were first identified by the obvious traces they left in the fossil record. In the strata corresponding to these time periods, the lower, older rock layer contains a great diversity of fossil life forms, while the younger layer immediately above is depauperate in comparison.