Visceral mass undergoes torsion in which of t | vedclass

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(A) Torsion is a characteristic developmental process in the class $Gastropoda$.During the larval stage,the visceral mass,mantle,and shell rotate $180

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Gastropoda

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(A) Torsion is a characteristic developmental process in the class $Gastropoda$.During the larval stage,the visceral mass,mantle,and shell rotate $180^{\circ}$ relative to the head and foot.This rotation brings the mantle cavity and the anus to a position above the head,which is a unique feature of gastropods.

Visceral mass undergoes torsion in which of the following classes of Mollusca?

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