dinosaurs became extinct during

Answer 1

the Cretaceous-Paleogene extinction event, which occurred about 66 million years ago. This extinction event wiped out non-avian dinosaurs, as well as many other species of plants and animals. The exact cause of the extinction is still debated, but it is widely believed that a combination of factors such as an asteroid impact, volcanic activity, and climate change contributed to the demise of the dinosaurs.