How Do Seashells Form?


A seashell is the external skeleton of a mollusk. The shell is formed through the secretion of proteins and minerals from mantle tissue which is contact with the shell.
1 Additional Answer
Seashells are the exoskeleton of the animal that creates it. The shells are made up mainly of calcium, and they are formed, The animal secretes the calcium material and grows to make a bigger shell. You can find more information here:
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