Find out where the shells come …
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Meghna Thapar 5 years, 5 months ago
Most seashells come from mollusks, a large group of marine animals including clams, mussels, and oysters, which exude shells as a protective covering. Shells are excreted from the outer surface of the animal called the mantle and are made up of mostly calcium carbonate. As mollusks develop in the sea, their mantle tissue absorbs salt and chemicals. They secrete calcium carbonate, which hardens on the outside of their bodies, creating a hard shell. ... When a mollusk dies it discards its shell, which eventually washes up on the shore. This is how seashells end up on the beach.
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