A diagram in the course handout shows that a sea star opens a bivalve shell by attaching many small hydraulic projections to it. Identify the related structure or process.

Tube feet are extensions of the water vascular system. In sea stars, they help in locomotion, attachment, feeding, and manipulating prey. This MCQ belongs to the Echinodermata topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.