Between the small intestine and the large intestine is a sphincter-type valve called the Ileocecal Valve (ICV). The purpose of this valve is to âprevent backflowâ from the Large Intestine, once any material leaves the Small Intestine.
Dinosaurs are a diverse group of animals of the clade Dinosauria that first appeared during the Triassic period. Although the exact origin and timing of the evolution of dinosaurs is the subject of active research, the current scientific consensus places their origin between 231 and 243 million years ago. They became the dominant terrestrial vertebrates after the TriassicâJurassic extinction event 201 million years ago. Their dominance continued through the Jurassic and Cretaceous periods and ended when the Cretaceous-Paleogene extinction event led to the extinction of most dinosaur groups 66 million years ago.
The last dinosaurs died approximately 65 million years ago. Although the cause of their extinction is still a mystery, climatic change, diseases, changing plant communities, and geologic events could all have played a role.Lately, dinosaur extinction theories have been the subject of much debate and controversy. giant meteorite, they reason, could have landed with an impact that kicked up enough dust and debris to block out sunlight for a long time â leading to a deadly chain of events. Without the sun, all the plants died; without the plants, all the plant-eaters died; and without the plant-eaters, all the meat-eaters died.