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OpenStudy (anonymous):
What a is mollusc shell secreted by?
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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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