Pila and unio have an external shell and belong to phylum ________
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Pila and unio have an external shell and belong to phylum mollusca
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Pila and Unio have an external shell and belongs to a phylum Mollusca
Molluscan have a soft body which is why they are protected by a hard shell which is made up of calcium carbonate, from all sides. For locomotion, they have a muscular foot.
These shells have two openings, anterior and posterior openings which acts as mouth and anus.
Their commercial significance is their role in pearl formation.
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