How do chitons use their eight shell plates and broad foot?

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Conchyliologie Tableau de la Classification des Coquilles — mollusk Mollusk shell classification chart, c. 1861.

Chitons utilize their physical features to navigate and survive in their marine environments:

Eight Shell Plates: These dorsal plates provide the chiton with significant flexibility. This structure allows the animal to fit snugly into uneven rock crevices or to curl into a protective ball when it is detached from a surface.1
Broad Foot: Chitons use their large, flat foot to creep along surfaces and to cling firmly to rocks. Their grip can be so strong that they may be injured if pried loose by force.1

By combining these adaptations, chitons are able to inhabit the intertidal zone and other hard-bottom environments, where they use their radula to scrape algae from the rock surfaces.12