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小鱼是怎么睡觉的
更新时间: 2020-10-08 00:00:00  

脊椎动物都要睡觉,鱼是脊椎动物,也需要睡觉,以消除神经系统和肢体的疲劳,但是,鱼没有眼睑所以它们睡觉时,不能闭上眼睛。我们常常看到鱼在水中静止不动,鱼鳃一闪一闪地活动着,这正是鱼在睡觉的姿势,如果惊醒它,它又会在水中游动起来。

关键词: 怎么 睡觉

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