不可思议:鲜为人知人体十大最不寻常秘密(图)(3)
3、头大会引起嘴小
进化有时并不完美。如果出错,或许我们会有翅膀而不是智齿。有时无用的组织也会保留在物种当中,因为它们并没有坏处。早期,智齿被用作第三批碎肉的臼齿,但是,因为大脑的生长导致我们的下颚骨结构变化,使我们的嘴变的十分狭窄拥挤
相比蛇类的“嘴”,人类的嘴在进化过程中小了很多
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