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Answered 2008-05-06 23:15:25

The shark is an very old animal; it has been in the sea for a very long time; it has new teeth constantly; its teeth are a modification of the outer skin of the shark; it is an endangered species because it is good to eat and the oceans are overfished. The reason the oceans are overfished is that governments cant get together and figure out that we all need a working ocean...together. The sharks, all species, are elasmobranchs. That, when you look it up, tells you all about their physical structure.

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