Oysters are water animals and they belong in the class mollusk animals. Their soft body
is fitted into the shell which consists of two parts. Most of the time, oysters
don’t even open their shells.
So how are they eating their food? Oysters have two siphons,
one is for insertion and the other one for exportation. Water enters directly
to the mouth where there is a specific filter who filtrates the water from the
planktons and then, food is digested.
The shell from the oyster is made of three types of cover:
periostracum, konchiolin and nacreous.
The top of the shell is the oldest part and it called umbo.
Some species of oysters can weigh up to 200 kilograms.
At the end, a fun fact about the pearls. Namely, they begin forming
when something enters the oyster, such as sand.
Then the oyster releases nacreous secrete around the granule of sand that’s
how pearls are formed.
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