Sharks Built for the Kill

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Sharks are cartilaginous fishes belonging to the class chondrichthyes of the vertebrates, Oceans cover 70 percent of the Earth’s surface and hold more than 20,000 species of fish. Of these, some 370 species are sharks! Long before dinosaurs existed, sharks roamed the waters. They first originated more than 400 million years ago and have changed very little in the last 100 million years. Today, few other species on Earth inspire so much respect and fear. These amazing predators sit at the top of Food chain.