book gills respiratory structure of???
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Book gills are still present in the marine arthropod Limulus (horseshoe crabs) which have five pairs of them, the flap in front of them being the genital operculum which lacks gills. Book gills are flap-like appendages that effect gas exchange within water and seem to have their origin as modified legs.
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hii ☺
Gills are the respiratory structure of Fishes.
hope that helps uh..☺
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