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In page Shark:

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Generally sharks have only one layer of tesserae, but the jaws of large specimens, such as the bull shark, tiger shark, and the great white shark, have two to three layers or more, depending on body size. The jaws of a large great white shark may have up to five layers.[2] In the rostrum (snout), the cartilage can be spongy and flexible to absorb the power of impacts.[citation needed]