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Sharks are a group of cartilaginous fish known for their streamlined bodies and predatory behavior. They are found in oceans worldwide and have existed for over 400 million years, making them some of the oldest surviving vertebrates. Sharks play a vital role in marine ecosystems as apex predators, helping to maintain the balance of species below them in the food chain. There are over 500 species, ranging from the small dwarf lanternshark to the large whale shark.