How do scientists identify a mass extinction event in the fossil record?
a. They look for a single species going extinct.
b. They look for all the genera going extinct in a short period of time.
c. They look for a lot of species going extinct over a long period of time.
d. They look for large drop in the number of genera over a short period of time.
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How do scientists identify a mass extinction event in the fossil record?
a. They look for a single...
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