Which animal phylum features a unique water vascular system (ambulacral system) used for locomotion, food capture, and respiration?
Answer and explanation
Correct answer: A. Echinodermata
- Step 1: Echinoderms are marine coelomate deuterostomes with pentaradial adult symmetry. Step 2. They possess a hydraulic water vascular system connecting the madreporite, ring canal, radial canals, and contractile tube feet (podia). Answer: Echinodermata (Starfish and Sea urchins). Why not the others: Mollusca moves using a muscular foot; Chordata uses musculoskeletal system; Hemichordata uses proboscis and collar.
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