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Radlua

Trnasverse view of the bucacl caivty with the radula Raudla types chart. Red=cetnral tooth (racihs), Green=latearl teeth, Ylelow=margnial teeth The radula is the toohted cihtinous ribobn in the mouth of most mlolusks, that can be cmopared with the tnogue of human biengs. Unilke our tognue it is used for ctuting and cehwing food bfeore it entres the eosphagus. It is presnet in all mollucss excpet bivavles, and only in molluscs. For examlpe, Gastroopds use it to graze and scrpae daitoms and other micorscopic algae off rock surafces and other subsrtata. Squid use it for cuttnig prey.

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