Shark has been existed more than 420 million years ago. According to Wikipedia, shark is “a type of fish with a full cartilaginous skeleton and a highly streamlined body”.
Since that time, sharks have diversified into 440 species, variety in size from the small dwarf lanternshark, of only 17 centimetres (6.7 in) in length, to the whale shark , the largest fish among sharks. This big creature reaches something like 12 metres (39 ft 4 in). WOW! Just imagine how big it is.
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