Why are dinosaurs extinct?

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Dinosaurs lived more than 117 million years. They adapted and survived all the changes, including and hot and cold climates. However, they suddenly disappeared from earth 66 million years ago. Scientists were unable to find the exact cause that made dinosaur wiped out from earth.

It is true that dinosaur extinct, but their descendants still live among us. They are birds. How they survived while others are dying?

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