how dinosaurs extinct ?
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Reverse genetic engineering and the fossil record both demonstrate that birds are modern feathered dinosaurs, having evolved from earlier theropods during the late Jurassic Period. As such, birds were the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event 66 million years ago.
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A large comet or asteroid hit the earth. Thousands, if not millions of pieces from the asteroid traveled and each hit, one by one while the strong wind and fire from the asteroid wiped out million and millions of dinosaurs. Some did survive but then volcanic eruptions, floods, tsunamis, droughts, wildfires, storms, lack of oxygen, a lot of carbon dioxide, no sunlight and trees caused the dinosaurs to die.
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