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1、Dinosaurs,the Extinction of Dinosaurs,Three Theories,Theory 1: The worldwide temperature rise at the end of the Cretaceous, which caused the male dinosaurs testes to stop function. As a result, sterilization stopped, leading to extinction of the dinosaurs.,Theory 2: The second theory attributes the
2、disappearance of dinosaurs to their ingesting psychoactive agents contained in flowing plants.,Theory 3: An asteroid hit the earth, causing a cloud of dust to block out the sun. This halted photosynthesis光合作用 and dropped the temperature, and multiple creatures died.,霸王龙 Tyrranosaurus 雷龙 Brontosaurus 禽龙 Iguanodon 剑龙 Stegosaurus 钩龙 Ankylosaurus 三角龙 Triceratops,
