Sharks

Sharks are a type of fish with a full cartilaginous skeleton and a streamlined body. They respire with the use of five to seven gill slits. Sharks have a covering of dermal denticles that protect their skin from damage, parasites and improve fluid dynamics; they also have replaceable teeth. The classic view of the shark is that of a solitary hunter, ranging the oceans in search of food; however, this is only true for a few species, with most living far more sedentary, benthic lives.

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The likely origin of the work shark is from the German word schurke, which means villain.

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