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为什么鱼在水里
更新时间: 2020-09-19 00:00:00  

生物生存的基本条件之一,就是需要氧气,鱼生活在水中,也需要呼吸,但鱼的呼吸器官不是鼻子,它的鼻孔不和口腔相通,是单纯的嗅觉器官,而鱼鳃才是鱼的主要呼吸器官,这就决定了鱼的呼吸和其他陆地动物的不同。鱼所生活的水域是溶有氧气的,不过溶氧很低,鱼鳃的结构正好和这种生存条件相适应。

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