( Arthropods ( ( possess ( a ( semi-closed ( circulatory system ) ) ) ) . ) )
(ROOT (S (NP (NNS Arthropods)) (VP (VBP possess) (NP (DT a) (JJ semi-closed) (NN circulatory) (NN system))) (. .)))
Arthropods possess a semi-closed circulatory system.
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP possess) (NP (DT a) (JJ water-based) (NN circulatory) (NN system))) (. .)))