INTRODUCTION OF SHARK
Sharks are a type of fish with a full cartilaginous skeleton and a highly streamlined body. Shark also known as Selachimorpha. The earliest sharks that exist in this world are known more than 420 million years ago.
SHARK FEATURES
The smallest shark was only 17 centimetres and the largest shark that has been found from all over the world is 12 metres.
Sharks are found in all seas in the world and are common down to depths of 2,000 metres or 6,600 feet. They generally do not live in freshwater except for the bull shark and there are also some species that can live both of the water condition which is seawater and freshwater. They breathe through five to seven gill slits.
Sharks have a covering of dermal dentils that protects their skin from damage and parasites, and improves their fluid dynamics so the shark can move faster. They have several sets of replaceable teeth.
SHARK TEETH
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