6 Facts About Hammerhead Sharks
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Pisces In some classifications, a superclass of the Gnathostomata (jawed chordates) consisting of the fishes (compare Tetrapoda). The whole body of a fish is covered with a tough, normally scaly, skin (see scales), which extends over the eye as well as contains pigments as well as sometimes slime glands. The circulatory system is a single circuit with blood passing via two sets of veins, one at the gills as well as the other in the body tissues. Three semicircular canals are present in the inner ear. The sense of scent is specifically well created as well as pressure waves are identified by the lateral-line system (see lateral-line canal). Fossils of fish date back to the Ordovician period, 505-- 438 million years ago. There are two lessons of modern fish: Chondrichthyes (cartilaginous fishes) as well as Osteichthyes (bony fishes).
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