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鱼儿嘴巴一张一合是在干嘛
更新时间: 2021-04-28 04:46:09  

1、鱼儿嘴巴一张一合是在呼吸空气,同时,鱼嘴巴一张一合的时候还会吃掉水中部分微生物以及其它食物,并将体内的杂物过滤出来。

2、鱼儿在水中游泳时,身上的每个鳃片、鳃丝以及鳃小片都是处于完全张开的状态,以此来增大鳃和水的接触面积,从而摄取水中更多的氧气。

关键词: 鱼儿 嘴巴

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