( They ( ( possess ( ( ( a ( spacious coelom ) ) , ) ( ( ( ( ( a ( ( closed circulatory ) system ) ) , ) ( an ( ( efficient excretory ) system ) ) ) and ) ( a ( ( closed circulatory ) system ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP possess) (NP (NP (DT a) (JJ spacious) (NN coelom)) (, ,) (NP (NP (DT a) (ADJP (JJ closed) (JJ circulatory)) (NN system)) (, ,) (NP (DT an) (ADJP (JJ efficient) (JJ excretory)) (NN system)) (CC and) (NP (DT a) (ADJP (JJ closed) (JJ circulatory)) (NN system))))) (. .)))
They possess a spacious coelom, a closed circulatory system, an efficient excretory system and a closed circulatory system.
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP possess) (NP (DT a) (JJ water-based) (NN circulatory) (NN system))) (. .)))