Though many people may disagree with me, here is my explanation:
Have you heard of the story of Noah's Ark from the Bible? This story is not just made up, it's history.
During the flood, all the dinosaurs died because they drowned and could not fit in the ark.
Though you guys may not believe me, this is true. Scientists have made all these other reasons, because they want the Almighty God out of the picture. But what I am telling you is the truth. I probably will be censored and am not politically corrrect, but this is what really happened to the dinosaurs.
Hopefully this helps!