第1个回答 2014-12-06
About 255 million years ago, the planet emergence of a new class of reptiles. Like al
l reptiles, they are the descendants of the eggs hatching out of their skin covered with scales, impervious, and this is the dinosaur. Emerged from the demise of the dinosaurs until, up to rule the Earth 1.6 billion years old.本回答被提问者和网友采纳