( Mammals ( ( possess ( ( ( a ( four-chambered heart ) ) and ) ( a ( double-loop ( circulatory system ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Mammals)) (VP (VBP possess) (NP (NP (DT a) (JJ four-chambered) (NN heart)) (CC and) (NP (DT a) (JJ double-loop) (NN circulatory) (NN system)))) (. .)))
Mammals possess a four-chambered heart and a double-loop circulatory system.
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP possess) (NP (DT a) (JJ water-based) (NN circulatory) (NN system))) (. .)))