( ( ( ( Structural adaptations ) ( of ( submersed ( vascular plants ) ) ) ) ( to ( ( ( gas exchange ) and ) ( oxygen transport ) ) ) ) . )
(ROOT (NP (NP (JJ Structural) (NNS adaptations)) (PP (IN of) (NP (JJ submersed) (NN vascular) (NNS plants))) (PP (TO to) (NP (NP (NN gas) (NN exchange)) (CC and) (NP (NN oxygen) (NN transport)))) (. .)))
Structural adaptations of submersed vascular plants to gas exchange and oxygen transport.
(ROOT (S (NP (NN Oxygen) (NN gas)) (VP (VBZ is) (VP (VBN given) (PRT (RP off)) (PP (IN by) (NP (NNS plants))))) (. .)))