 Snails
belong to the group of animals called mollusks, which also includes clams
and mussels. Mollusks have soft bodies, often enclosed within a hard shell.
Snails have a "foot" on the underside that helps them to move around. They
occur in most any freshwater ecosystem and are particularly common in areas
with hard water, which may be rich in calcium. The snails use the calcium
to build their shells. |
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