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Torsion is a biological process that occurs during the development of certain mollusks, particularly gastropods, resulting in a 180-degree rotation of the body along its axis. This rotation causes a shift in the position of the internal organs and the body, resulting in the asymmetry commonly observed in adult gastropods, such as snails. Torsion is an important aspect of the evolutionary and developmental biology of gastropods and plays a significant role in their anatomy and behavior. The process of torsion begins during the larval stage of gastropod development. As the gastropod embryo matures into a veliger, which is the free-swimming larval stage, the body undergoes a series of changes. At this stage, the larval gastropod is bilaterally symmetrical, with its body parts arranged evenly on either side __________ _____ _________ ________ __________ _______ ____ __________ __________ _________ __________.
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