Many animals with shells are born with
a small shell. As the animal get older,
its shell grows bigger.
Shelled animals get calcium carbonates
and other minerals from water and food
they eat.
They have special organs that turn
the minerals into shell material that
they secretes in layers.
Example;oyster makes a pearl in the same way
as it makes its own shell.
estidotmy
30 MAC 2005
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