dinasours were lived in alaskas

The article states that a lot of fossils of dinosaurs in the names of edmontosaurs were found in the deposits on Alaska's North Slope where today it has a very rigid and cold climate, but paleontologists suggested that the dinosaurs migrated from there during the winter and provide three reasons of support. However, the professor explains that the migration hypothesis is not convincing and refutes each of the author's reasons. First, the reading states that the diet of edmontosaurs was based on plants. They had to migrate during the winter because there was not any plant during the winter. The professor opposes this point by saying that the temperature was very warmer in the past during these summer in the North Slope winter and sunshine during the day made a good condition for plenty of plants during the summer and, a lot of vegetation remained for cold days. Second, the reading claims that the skeletons of edmontosaurs were found in the same areas that revealed they were lived in herds. In contrast, the professor says that they do not migrate for coordinating their migration. They lived in herds to provide extra protection for predators. According to professor Rosavelt elks also live in herds but, they do not migrate. Third, the article says that the size of edmonosaurs was very large, and they could migrate so fast and their physical bodies helped them to be capable for migrating long distances. The professor casts doubt on this point by saying that only the matures of them were capable for that trip and, juveniles were not capable for such a long destination. She also states that the adult edmonosaurs could not survive without the help of their parents.