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The Earth’s Worst-Ever Extinction Event Wiped Out 90% of All Animal SpeciesEveryone knows that dinosaurs are extinct, and most people have some idea about how it might have occurred. But the exact ...
The oldest is the Paleozoic Era, which means ‘ancient life’ and occurred between 541 and 252 million years ago. Next is the Mesozoic Era, which means ‘middle life’ and spans 252 to 66 ...
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