Why do the flaps on both sides of the face head alternately open and close
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YOU WILL FIND FLAP LIKE STRUCTURES ON BOTH SIDES OF THEIR HEADS. THESE ARE FLAPS WHICH COVER THE GILLS. THESE FLAPS OPEN ANA CLOSE ALTERNATELY. ... The gills contain filaments that have lamellae which increases the surface area of the gills to extract more oxygen from water.
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THESE ARE FLAPS WHICH COVER THE GILLS. ... The gills contain filaments that have lamellae which increases the surface area of the gills to extract more oxygen from water. In this way fish open and closes the lid alternately for respiration.
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