( ( ( The ( water ( vascular system ) ) ) ( of ( the echinoderm ) ) ) ( is ( used for ) ) )
(ROOT (S (NP (NP (DT The) (NN water) (NN vascular) (NN system)) (PP (IN of) (NP (DT the) (NN echinoderm)))) (VP (VBZ is) (VP (VBN used) (PP (IN for))))))
The water vascular system of the echinoderm is used for
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP possess) (NP (DT a) (JJ water-based) (NN circulatory) (NN system))) (. .)))