Question

15) In Pila,
closes the aperture or the
mouth of the shell.
O a) Suture
Ob) Collunella
O c) Operculum
O d) Lid​

Answer 1

Explanation:

The operculum is attached to the upper surface of the foot and in its most complete state, it serves as a sort of "trapdoor" to close the aperture of the shell when the soft parts of the animal are retracted. The shape of the operculum varies greatly from one family of gastropods to another.

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