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.
How many years ago did the trilobites go extinct? Quoth the wikipedia (linked below) ----- The last of the trilobites disappeared in the mass extinction at the end of the Permi â¦ an about 250 million years ago.