There are a lot of snails where I live at the moment, some have a shell while others don’t! I don’t know how they acquire their shell, what it is used for, and why some don’t have any.
In: Biology
Snails grow their own shells by secreting a shell-making substance from their bodies. The substance has many special chemicals in it, but the major part of it is usually calcium carbonate (a common material we encounter as chalk, and in our antacids in the drugstore). These shells grow gradually in layers.
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