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In my own opinion , Though their extinction is a mystery . I think why dinosaurs became extinct on earth it's because of maybe geologic events , a big meteorite crashed into the earth that it changed the climate conditions so explicit that dinos could not withstand or survive the impact of meteorites. Some case would be a disease that dinos would be wiped out the entire population and food chain imbalance. There are some also theories if you have time you could research this from the internet.
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Dinosaur extinction is a mystery,But Scientist concluded what things that made dinosaurs extinct it is called Cretaceous tertiary extinction or (k-t ) extinction,according to them it is a massive extinction that includes dinosaurs,plants and animals present.It happens about 65-66 million years,and made it wiped out the entire dinosaur species which according to them are the changes in climate and moisture patterns which has great effects in their survival
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