Yes. The shell makes up the exoskeleton of clams and other mollusks. Clams produce Calcium Carbonate to form their shells, which is the also the main component in egg shells, the shells of snails, and also pearls. The shell grows gradually with the addition of ‘rings’, which can be used much like tree rings to identify their age.
They do. Clams have muscular tissue on the edge of the mantle (the inner surface of the shell) and this muscle is thick and it deposits new shell material at the edge. The rings on the edges identify the age of the clam as well.
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