Question

what do echinoderms use their water vascular system for? helps with movement and attachment to surfaces helps with digestion of food helps with reproduction

Explanation:

Echinoderms' water vascular system (with tube feet) functions in locomotion (movement) and attaching to surfaces. Digestion is handled by their digestive system, and reproduction has separate reproductive structures/processes, so the correct option is the one about movement and attachment.

Answer:

A. helps with movement and attachment to surfaces