✳ Shells are the protective outer layer; a.k.a external skeletons of mollusks.
✳ Shells that open to the left are very rare [9 out of 10 open to the right]. ✳ It’s unknown how many seashell species exist. ✳ Shells were once used as currency.
✳ The perfect holes you sometimes see in shells were most likely made by predators who tried to drill their way in.
✳ Seashells are the exoskeletons of mollusks such as snails, clams, oysters and many others.
✳ Unlike seashells, turtle shells have living cells, blood vessels and nerves, including a large number of cells on the calcareous shell surface and scattered throughout its interior.
✳ The shell is part of the body of the animal.
✳ Seashells are primarily made of calcium.
✳ Shells also help camouflage some animals.
✳ Shell collecting is one of the oldest-known hobbies.
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