为什么动物有尾巴?
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.
为什么
A85;H146.3;H042
2023-10-13(万方平台首次上网日期,不代表论文的发表时间)
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