( Echinoderms ( ( have ( ( a ( unique ( water ( vascular system ) ) ) ) ( with ( tube feet ) ) ) ) . ) )
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP have) (NP (NP (DT a) (JJ unique) (NN water) (NN vascular) (NN system)) (PP (IN with) (NP (NN tube) (NNS feet))))) (. .)))
Echinoderms have a unique water vascular system with tube feet.
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP possess) (NP (DT a) (JJ water-based) (NN circulatory) (NN system))) (. .)))