From that point forward, sharks have differentiated into in excess of 470 species. They run in size from the little diminutive person lanternshark (Etmopterus perryi), a remote ocean types of just 17 centimeters (6.7 in) long, to the whale shark (Rhincodon typus), the biggest fish on the planet, which arrives at pretty nearly 12 meters (39 ft) long.
Sharks are found in all oceans and are normal to profundities of 2,000 meters (6,600 ft). They by and large don't live in freshwater despite the fact that there are a couple of known exemptions, for example, the bull shark and the waterway shark, which can survive and be found in both seawater and freshwater. They inhale through five to seven gill openings. Sharks have a blanket of dermal denticles that ensures their skin from harm and parasites notwithstanding enhancing their liquid flow. They have a few sets of replaceable teeth