Describe the general morphology of pearl bivalves. 

Pearl bivalves, also known as pearl mussels or freshwater mussels, belong to the family Unionidae. They are characterized by their unique morphology, which is adapted for their freshwater habitat and their ability to produce pearls. Here is a description of the general morphology of pearl bivalves:

1. Shell: The shell of a pearl bivalve is the most prominent and recognizable feature. It is composed of two hinged halves called valves, which are usually symmetrical. The shell is made of calcium carbonate and is hard, providing protection for the soft parts of the animal. The shape and color of the shell can vary greatly among species. The outer surface of _________ ____ __________ ______ ______ __________ ______ _____ _____ _________ _________.
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