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By using their Gills
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Gases exchange in fish by the external gills Gills found on the surface of phyrinx in fish . In gills have a multiple count of lammelle these lammelle contact in water and blood cells of lammelle directly contected with water to exchange the gasses Gills lammelle have many blood cells and outer surface of lammelle have small size cilia. The flow of blood direction in gills lammelle and flow of water on surface of it is opposite. Through the opposite direction of flow of water and blood gasses exchange do here After this blood absorbed the CO2 and excrete through the diffusion

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