What Was Earth Like in the Age of Giant Insects?

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Over 300 million years ago, before the age of giant dinosaurs, Earth was covered with giant insects. Why were insects so enormous during this time? What did oxygen have to do with it? And why did these insects go extinct?
Over 300 million years ago, before the age of giant dinosaurs, Earth was covered with giant insects. Why were insects so enormous during this time? What did oxygen have to do with it? And why did these insects go extinct?

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