Why the dinosaurs disappear

Some of the theories explained in the essay “Sex, Drugs, Disaster, and the Extinction of the Dinosaurs” do not have evidences to prove it. How can we know that died by massive overdoses of some kind of poisons or they died by sterilization of male? There are not facts about it, but one theory has evidences. This theory says that a large comet or asteroid struck the earth and killed all kind of live in the planet. The evidence of this event is near of Florida, in the Caribbean Sea, where there is a hole cause by a large impact. There are another theories about the extinction of the dinosaurs, one them say that the temperature star to decreased under cero point and another one say that the dinosaurs did not disappear they just evolved to the animals we know today.