Sharks have existed since more that 300 million years ago, before dinosaurs. These mysterious creatures of the deep have always been sorrounded by mystery. Do you know that a shark's teeth are usually replaced every eight days. By the way, some species of sharks shed about 30.000 teeth in their life time. I think they are incredible, because sharks never get cancer so their cartilage is being studied in the hope of developing anti-cancer drugs. And a good news for you; out of all the people a shark attacks, more than 90% of them survive.
so their cartilage is being studied in the hope
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