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

The respiratory system of cartilaginous fishes, such as sharks and rays, primarily consists of gills, which are located in gill slits. These fish typically have five to seven pairs of gill slits, and water enters the mouth and flows over the gills, where oxygen is extracted and carbon dioxide is ________ __________ _______ _______ _______ ___ _____ _______.
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