In this set of the material, the reading suggests that dinosaurs are endotherms with evidences. The speaker in the listening, however, argues that the arguments in the reading could not prove the dinosaurs to be endothermic animals. 

First, the passage suggests that the existence of dinosaurs’ fossil in polar regions indicates that dinosaurs are endothermic. Fundamentally, only endothermic animals could be active in polar regions because they maintain their own temperature. The speaker, on the contrary suggests that the the polar argument could not prove dinosaurs to be endothermic. To be more specific, the dinosaurs live in the era with warmer overall temperature. Even in polar regions, the wether is suitable for animals that are not endothermic