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Millions of years ago-before dinosaurs-trilobites ruled the seas. These armored tanks dominated for almost 300 million years before their reign on Earth ended in a mass extinction that wiped out 90% of all living things. Some scientists think the oceans became too hot, depleting oxygen. But what if farting trilobites were partly to blame? Designed for early adolescent readers, this book features large print, simple drawings, and minimal use of complex words and theories-while still being informative enough to surprise even adults with fascinating facts about Ohio's prehistoric past. Inside, you'll find: