( ( ( What kind ) ( of ( circulatory system ) ) ) ( ( do humans ) have ) )
(ROOT (SBARQ (WHNP (WHNP (WDT What) (NN kind)) (PP (IN of) (NP (JJ circulatory) (NN system)))) (SQ (VBP do) (NP (NNS humans)) (VP (VB have)))))
What kind of circulatory system do humans have
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP possess) (NP (DT a) (JJ water-based) (NN circulatory) (NN system))) (. .)))