Describe the structure of the respiratory system of cartilaginous fishes and state how it differs from that of bony fishes.

The respiratory system of cartilaginous fishes, such as sharks and rays, consists primarily of gills, which are located in gill slits. These fishes typically have five to seven pairs of gill slits on each side of the head. The gill slits are directly exposed to the external environment, allowing water to flow over the gills, where gas exchange occurs. _______ ______ ____ _____ ________ ______ _____ __________ ___.
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