What is torsion? Briefly discuss the process of torsion in gastropods.

Torsion is a unique anatomical phenomenon observed in gastropods during their larval development. It refers to a 180-degree twisting of the visceral mass, mantle, and shell relative to the head and foot. This process results in the positioning of the mantle ______ __________ ______ ____ _________ _____ __________ _______ ____ _______.
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