( Water ( ( has ( been ( called ( ( the ( circulatory system ) ) ( of ( the earth ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Water)) (VP (VBZ has) (VP (VBN been) (VP (VBN called) (NP (NP (DT the) (JJ circulatory) (NN system)) (PP (IN of) (NP (DT the) (NN earth))))))) (. .)))
Water has been called the circulatory system of the earth.
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP possess) (NP (DT a) (JJ water-based) (NN circulatory) (NN system))) (. .)))