( ( ( The majority ) ( of ( constructed ( wetland projects ) ) ) ) ( ( ( ( are ( young sites ) ) and ) ( ( are typically ) ( productive ecosystems ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN majority)) (PP (IN of) (NP (ADJP (VBN constructed)) (JJ wetland) (NNS projects)))) (VP (VP (VBP are) (NP (JJ young) (NNS sites))) (CC and) (VP (VBP are) (ADVP (RB typically)) (NP (JJ productive) (NNS ecosystems)))) (. .)))
The majority of constructed wetland projects are young sites and are typically productive ecosystems.
(ROOT (S (NP (JJ Young) (NNS roots) (CC and) (NNS leaves)) (VP (VBP are) (NP (NP (DT the) (JJ major) (NNS sites)) (PP (IN of) (NP (NN gibberellin) (NN production))))) (. .)))