Geological history of bivalves

Bivalves, a class of mollusks with a two-part hinged shell, have a long and significant geological history. They first appeared in the Cambrian period, approximately 540 million years ago. Early bivalves were relatively simple, characterized by a small, symmetrical shell. Over time, ____ _______ ________ _____ ____ _______ _________ _________ ______ _______ ____.
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