Why Did Dinosaurs Disappear

another, without the other they could not occur. If the extinction of the dinosaurs was gradually over millions of years “both process probably played a role”(DinoBuzz). Most scientists do agree that an asteroid was a factor, it’s also acknowledged thaDinosaurs roamed the earth for 163 million years.(Dinosaur Worlds). They thrived as one of the most successful groups of animals in the history of life on land(PBS). Then, 66 million years ago, the last group of dinosaurs disappeared forever; leaving us with the question - what killed the dinosaurs? And how did they disappear? Was a gradual or a quick and calamitous end?
The “Cretaceous-Paleogene (K-Pg) Extinction Event took such a significant blow to life on Earth it marked the end of the Cretaceous period that fell at the end of the Mesozoic Era, which gave way to the Paleogene Era (SciShow). The first period of the Cenozoic Era that continues today. Scientists have been discussing what happened to the dinosaurs since 1980 and have come up with many theories (Dave Smith). In spite of much research and study, scientists are still not certain what …show more content…
Most of the fossil records come from North American leaving us with little knowledge about what was going on in the rest of the world. Extinction itself is very complicated. DinoBuzz said “Extinction is not a simple event; it is not simply the death of all representatives of a group. It is the cessation of the origination of new species that renders a group extinct;...” Determining the age of fossils and rocks is not easy and most methods of age determination are not very accurate. Many hypotheses sound convincing, but are very difficult to prove or disapprove if they caused the extinction or if they were just