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The radula is a ribbonlike structure with teeth that is found in the mouths of mollusks, except for bivalve mollusks. The radula contains rows of many small teeth, and can be extended outside the mollusk's body like a tongue.  Mollusks can use the teeth of the radula to drill holes in its prey.  The radula can also be used to scrape pieces of food from a surface.  The teeth are a very important part of the radula, so teeth that are worn away will be regenerated.  Scientists can actually examine the teeth on the radula to determine what species the mollusk is.

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