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What are seashells made of?

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Seashells are the exoskeletons of mollusks such as snails, clams, oysters and many others. Such shells have three distinct layers and are composed mostly of calcium carbonate with only a small quantity of protein--no more than 2 percent. These shells, unlike typical animal structures, are not made up of cells. read more

[[RUBATO]][&Seashells&] living in the Persian Gulf. A [&seashell&] or sea shell\, also known simply as a shell\, is a hard\, protective outer layer created by an [&animal&] that lives in the sea. The shell is [&part&] of the body of the [&animal&]. Empty [&seashells&] are often found washed up on beaches by beachcombers. read more

A: Seashells are made when marine mollusks such as snails, clams and oysters secrete minerals and proteins through their mantle, which is the outermost part of their body that comes in contact with the shells. Shells are made mostly of calcium carbonate; less than 2 percent of their mass is made of proteins. read more

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A heart made out of seashells Stock Photo, Royalty Free ...
Source: alamy.com

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