Class ChondrichthyesAre jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage (rather than bone). Examples of are sharks and manta rays.
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Class Osteichthyes
Are a taxonomic superclass of fish, also called bony fish. The vast majority of fish are osteichthyes. Osteichthyes are the most various group of vertebrates, consisting of over 29,000 species, making them the largest class of vertebrates in existence today.
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