Fish are characterized by an aquatic environment, but in order to exist in it, they needed numerous adaptations.
The streamlining of the fish bodies provides the ability to move quickly, reducing the resistance of the environment to a minimum value, and the presence of scales and mucus contributes to this. The fin-shaped limbs allow you to move at high speed in the water. The lateral line allows these animals to orient themselves well. Also, for the assimilation of oxygen dissolved in water, there is a special respiratory organ – gills.
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