恐龙比人类在地球上出现约早几千万年。这已经通过在世界各地发掘出来的化石得到了证实。恐龙有食肉的,也有食草的,体形巨大,重可达50吨,长可达30米,利用四足或后足行走。恐龙与现在生活在地球上的蜥蜴、蛇、鳄等属同类,是由卵孵化出来的。恐龙的骨骼组织很严密,这对支撑庞大的身体行走是很有好处的。另外,恐龙的身体表面被鳞、骨片样的东西所覆盖着,这样可以防 Dinosaurs appear tens of millions of years earlier than humans on earth. This has been confirmed by the fossils that have been excavated around the world. Dinosaur carnivorous, but also herbivorous, huge body, weighing up to 50 tons, up to 30 meters long, the use of four-legged or hind foot walking. Dinosaurs are similar to lizards, snakes and crocodiles that now live on Earth and hatch from eggs. Dinosaurs have very tight skeletal structures, which are good for supporting large bodies. In addition, the body surface of dinosaurs covered by scales, bone-like things, so you can prevent