List the characteristics of a mollusk?
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Characteristic Features of Phylum Mollusca
They are bilaterally symmetrical.
They are triploblastic, which three layers.
They show organ system grade of organisation.
The body is soft and unsegmented.
Body is divisible into three regions – head, a visceral mass, and ventral foot.
Body is covered by a mantle and shell.
Some common features are :
Unsegmented soft body with bilateral symmetry.
Presence of an internal or external shell.
A toothed tongue (made mostly of chitin) called the radula.
A mantle which is a fold in the body wall that lines the shell.
Muscular foot (and/or tentacles in some).
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