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小鱼为什么没有脚印
更新时间: 2021-02-18 16:47:49  

1、小鱼没有脚,当然没有脚印。

2、鱼类是以鳃呼吸、通过尾部和躯干部的摆动以及鳍的协调作用游泳和凭上下颌摄食的变温水生脊椎动物,属于脊索动物门中的脊椎动物亚门,一般人们把脊椎动物分为鱼类(53%)、鸟类(18%)、爬行类(12%)、哺乳类(9%)、两栖类(8%)五大类。

关键词: 为什么 没有 脚印

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