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 ________ ___ __________ ________ _________ __________ __________ _______ ________ ______ ___ _______.
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