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Sharks square measure a bunch of chondrichthian fish characterised by a grisly skeleton, five to seven-gill slits on the perimeters of the top, and pectoral fins that aren't consolidated to the top. Trendy sharks square measure classified at intervals the cluster} Selachimorpha (or Selachii) and square measure the sister group to the rays. However, the term 'shark' has additionally been used for extinct members of the class outside the Selachimorpha, like Cladoselache and Xenacanthus, additionally as alternative class like the homalocephalid eugenedontidans.
Under this broader definition, the earliest better-known sharks initiate to quite 420 million years past. Acanthodians square measure typically cited as 'spiny sharks'; though they're not a part of class correct, they're a paraphyletic assemblage resulting in fish as a full. Since then, sharks have wide-ranging into over five hundred species. They vary in size from the tiny dwarf lantern shark (Etmopterus perryi), a deep ocean species of solely seventeen centimetres (6.7 in) long, to the Rhincodon typus (Rhincodon typus), the most important fish within the world, that reaches about twelve metres (40 ft.) long. Sharks square measure found all told seas and square measure common to depths of 2000 metres (6,600 ft.).
Well-known species like the good man-eater, requiem shark, blue shark, mako shark, fox shark, and hammerhead square measure apex predator's organisms at the highest of their underwater organic phenomenon. Several shark populations square measure vulnerable by human activities. The oldest typically accepted shark scales square measure from regarding 420 million years past, within the Silurian. The primary sharks looked terribly totally different from trendy sharks. At now the foremost common shark tooth is that the cladodont, a method of the skinny tooth with 3 tines sort of a spear, apparently to assist catch fish. The bulk of recent sharks will be derived back to around one hundred million years past. Most fossils square measure of teeth, typically in giant numbers. Partial skeletons and even complete inflexible remains are discovered. Estimates recommend that sharks grow tens of thousands of teeth over a period that explains the bumper fossils. The teeth accommodate simply inflexible phosphate, an appetite. Once a shark dies, the mouldering skeleton breaks up, scattering the mineral prisms. Preservation needs fast burial in bottom sediments.

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