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 cavity, along with the anus and gills, above ____ ____ ________ _________ __________ ____ ______.
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