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3 votes
What period of the paleozoic era did a mass extinction occur?

A. Devonian
B. Pennsylvanian
C. Siluarian
D. Permian

User Mdml
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2 Answers

1 vote
I believe the correct answer is D. Permian.
User SandTh
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6 votes
From what I can remember, from the short study I did on this, I would say Permian. 
User Aminul Haque Aome
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