b is the correct option as they help in locomotion...
*all above are correct but the most appropriate is B..allow echinoderm to flow with ocean currents.. *
The muscular contractions in echinoderms force water into tube feet, enabling them to attach to surfaces and move. This process is part of their water vascular system, which is vital for their locomotion. The correct answer is option d, which addresses the attachment function of the tube feet.
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