6 Hammerhead Sharks Facts
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Pisces In some categories, a superclass of the Gnathostomata (jawed chordates) making up the fishes (contrast Tetrapoda). The entire physical body of a fish is covered with a tough, typically scaly, skin (view scales), which crosses the eye and also contains pigments and also sometimes slime glandulars. The blood circulation system is a solitary circuit with blood passing with 2 collections of blood vessels, one at the gills and also the various other in the physical body cells. 3 semicircular canals exist in the internal ear. The feeling of odor is especially well established and also pressure waves are detected by the lateral-line system (view lateral-line canal). Fossils of fish go back to the Ordovician duration, 505-- 438 million years ago. There are 2 courses of modern fish: Chondrichthyes (cartilaginous fishes) and also Osteichthyes (bony fishes).
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