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Shell (zoology)

A display of shells of marine mollusca, including abalone, scallop and blue mussel

A shell is a hard outer layer, which has evolved in a very wide variety of different animals, including molluscs, sea urchins, crustaceans, turtles and tortoises, armadillos, etc.[1]

  1. ↑ Scientific names for this type of structure include exoskeleton, test, carapace, and peltidium.

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