+Shell growth is the biological process where creatures like mollusks and crustaceans form and enlarge their hard, protective outer casings. This incremental addition of [Calcium](/wiki/calcium) and organic matrix allows for increasing body size, often visible as growth lines. It is a vital aspect of [Animal Development](/wiki/animal_development) and adaptation.
+## See also
+- [Mollusk](/wiki/mollusk)
+- [Exoskeleton](/wiki/exoskeleton)
+- [Biomineralization](/wiki/biomineralization)
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