What Killed the Dinosaurs

Introduction: I have decided to answer this question, as the extinction of dinosaurs has interested me since I was very young and I thought that by answering it, I could learn a lot more about what happened and broaden my knowledge of the subject! Answering about the dinosaurs would also keep me interested in the topic as I am working on it and I do not fully understand many parts so as I work on the case study I can learn more and stop myself from becoming bored. The subject has no concrete answer and probably never will but I hope to find my own personal opinion of what happened at the end and enjoyed and use what I have learnt in the future.
Background Science: Before I get into my arguments I will explain a bit of background behind dinosaurs, so you can have a better understanding of my case study and what I am trying to express. Dinosaurs are often brought up in the media and normal life and are also constantly referenced in relation to other animals and films but not many people actually know what a Dinosaur is! The word dinosaur actually means “terrible lizard”. Dinosaurs were actually reptiles, this means when they were hatched and born, they had no fur. Dinosaurs and lizards are in a way similar but also very different. The main difference between the two is how their legs join to the hips. Lizards have legs in a squatted position, with the legs going outwards. However dinosaurs have legs similar to humans where they go straight down!
The dinosaurs were first around about 245 million years ago, during the Mesozoic Era; which is often called the Age of the Reptiles. This era was split up into three sections, the Triassic which was from 245 million years ago to 208 million years ago, and then the Jurassic which was 208 million years ago to 146 million years ago and finally the Cretaceous period which lasted from 146 million years ago to 65 million years ago when dinosaurs started to die off.
Over many years scientists have developed many different