( ( Food ( chain ( ( The ( Plant Role ) ) ( in ( ( Ecosystems ( The ( Carbon Cycle ) ) ) ( in Ecosystems ) ) ) ) ) ) ( ( The ( Nitrogen ( Cycle ( PLANT ( ECOLOGY Plants ) ) ) ) ) ( ( are ( ( vital parts ) ( of ( ( nearly all ) ecosystems ) ) ) ) . ) ) )
(ROOT (S (S (NP (NNP Food)) (VP (VBP chain) (NP (NP (DT The) (NNP Plant) (NNP Role)) (PP (IN in) (NP (NP (NNP Ecosystems) (NNP The) (NNP Carbon) (NNP Cycle)) (PP (IN in) (NP (NNP Ecosystems)))))))) (NP (DT The) (NNP Nitrogen) (NNP Cycle) (NNP PLANT) (NNP ECOLOGY) (NNP Plants)) (VP (VBP are) (NP (NP (JJ vital) (NNS parts)) (PP (IN of) (NP (QP (RB nearly) (DT all)) (NNS ecosystems))))) (. .)))
Food chain The Plant Role in Ecosystems The Carbon Cycle in Ecosystems The Nitrogen Cycle PLANT ECOLOGY Plants are vital parts of nearly all ecosystems.
(ROOT (S (NP (NP (DT A) (JJ primary) (NN role)) (PP (IN of) (NP (NP (NNS decomposers)) (PP (IN in) (NP (DT an) (NN ecosystem)))))) (VP (VBZ is) (SBAR (IN that) (S (NP (PRP they)) (VP (VBZ cycle) (NP (NN matter)) (PP (IN by) (S (VP (VBG returning) (NP (NN carbon) (CC and) (JJ other) (NN matter)) (PP (TO to) (NP (DT the) (NN ecosystem)))))))))) (. .)))
A primary role of decomposers in an ecosystem is that they cycle matter by returning carbon and other matter to the ecosystem.