论文部分内容阅读
自生命诞生以来,地球上的生物经历了几次大的绝灭事件,其中尤以恐龙的绝灭引入注目。恐龙是中生代盛极一时的庞大家族,统治地球近1.7亿年之久。但在距今6500万年前的白垩纪末,恐龙在地球上却消失了,同时灭亡的还有翼龙、蛇颈龙、鱼龙等爬行动物,以及菊石、箭石等海洋无脊椎动物。在恐龙绝灭后的新生代,哺乳类、鸟类大量发展起来,直到今天还是这个世界的主人。为了解释以恐龙为代表的这次大规模绝
Since the birth of life, the creatures on earth have undergone several major extinctions, with attention drawn especially to the extinction of dinosaurs. Dinosaurs are a huge family of Mesozoic ecclesiasticals that ruled the earth for nearly 170 million years. However, at the end of the Cretaceous 65 million years ago, the dinosaurs disappeared on the earth. At the same time, there were also reptiles such as pterosaurs, plesiosaur, cichlid dragons, and marine invertebrates such as ammonites, . In the Cenozoic after the extinction of the dinosaurs, mammals and birds developed in large numbers and remain masters of the world till today. In order to explain the dinosaur represented by this massive must