2) In snail the mantle cavity is pushed forward and outward due to
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Torsion is an anatomical event which takes place during the very early part of the life of snails and slugs of all kinds. ... Torsion is the rotation of the visceral mass, mantle, and shell 180˚ with respect to the head and foot of the gastropod. This brings the mantle cavity and anus to an anterior position above the head.
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