The Great Dying, formally the Permian-Triassic extinction event, refers to the largest mass extinction of life on Earth in all history. It happened 252 million years ago (mya) at the end of the Paleozoic era between the Permian and Triassic periods, long before dinosaurs roamed.
a smaller industrial base, fewer rail lines, and an agricultural economy based upon slave labor made mobilization of resources more difficult
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Explanation: id say its the top 3 .
The 3rd one. The one about osama bin laden
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the belief in or worship of more than one god.
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