Article: The shark family tree.

In just about any ocean in the world, it's possible to find sharks. But with more than 450 shark species, how do scientists classify them? Sharks can generally be divided into eight orders, based on the attributes they share. Ground Sharks, Mackerel Sharks, Dogfishes, Carpetsharks, and four smaller orders grouped here under "Other Orders." Each order is divided into families, and each family has its set of species. Does that sound confusing? Like any family tree, it gets complicated, but each order shares some specific characteristics.

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Ground Sharks (Order Carcharhiniformes) include some of the most familiar types of sharks, such ...

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