摘要
科学家们发现的有尾巴的动物化石,其历史可以追溯到数亿年前。那时,早期的鱼类用尾巴作为鳍在海洋中游动和躲避天敌。随着这些鱼进化成为生活在陆地上的生物,它们的尾巴也开始发生变化。
Scientists have found fossils of animals with tails dating back hundreds of millions of years.Back then,early fish used their tails as fins to swim through oceans,and avoid enemies.As these fish developed into creatures that lived on the land,their tails started to change too.
