Plants and Animals

What is torsion?

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Ancient gastropods were probably bilaterally symmetrical, but living species undergo a process known as torsion in which most of the body behind the head rotates 180ยก so that the anal and urinary openings are relocated behind the head, and the digestive tract and nervous system become U-shaped.

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Similar questions: How do gastropods fit inside their shells? What is the difference between ancient and living species of gastropods? [ Hide these questions ]

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