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Bivalves are a class of molluscs characterized by a laterally compressed body enclosed within two calcareous shells or valves joined by a hinge. The two valves are symmetrical along the hinge line but may differ in size or shape. Each valve consists of three layers: the outer periostracum (organic), the middle prismatic layer (calcium carbonate), and the inner __________ _________ ________ __________ ___ ____ ______ _____ ______ ______ ____.
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