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OpenStudy (anonymous):

What a is mollusc shell secreted by?

OpenStudy (anonymous):

is it by the mantle?

OpenStudy (anonymous):

Mollusc shells are made of calcium carbonate. It consists of three layers to give extra strength including a tough outer covering, a chalky layer in the middle and a shiny one adjacent to the skin. In addition, they are made through excretions of shell material from the body of the mollusk.

OpenStudy (anonymous):

thanks

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