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a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon that is used for scraping or cutting food before it enters the oesophagus. It is unique to the molluscs, and is found in every class of mollusc except the bivalves.
an informal term for any living species which appears to be the same as a species otherwise only...
the part of the hindbrain that controls autonomic functions such as breathing, digestion, heart...