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Dear student,
The exoskeletons of mollusks, such as snails, are made of calcium carbonate. Calcium carbonate is a chemical compound with the formula CaCO3. These shells usually have three distinct layers made of primarily calcium carbonate, but unlike typical animal structures, these cells are not made up of cells.
However, your question is not clear. Please be a little specific to which you are referring here so that we can provide you with some meaningful help.
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The exoskeletons of mollusks, such as snails, are made of calcium carbonate. Calcium carbonate is a chemical compound with the formula CaCO3. These shells usually have three distinct layers made of primarily calcium carbonate, but unlike typical animal structures, these cells are not made up of cells.
However, your question is not clear. Please be a little specific to which you are referring here so that we can provide you with some meaningful help.
Regards