For semester exam preparation, consider this situation: during development of a snail, the visceral mass rotates so the mantle cavity shifts toward the anterior region. The correct conclusion is:

Correct Answer: C

torsion

Torsion is a developmental process in gastropods where the visceral mass rotates about 180 degrees. It changes the position of the mantle cavity and associated openings. This MCQ belongs to the Gastropoda topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.