( ( Describe ( how ( ( ( carbon and ) nitrogen ) ( are ( cycled ( within ( ( ( an ecosystem ) , ) ( including ( ( the roles ) ( of microorganisms ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Describe) (SBAR (WHADVP (WRB how)) (S (NP (NN carbon) (CC and) (NN nitrogen)) (VP (VBP are) (VP (VBN cycled) (PP (IN within) (NP (NP (DT an) (NN ecosystem)) (, ,) (PP (VBG including) (NP (NP (DT the) (NNS roles)) (PP (IN of) (NP (NNS microorganisms)))))))))))) (. .)))
Describe how carbon and nitrogen are cycled within an ecosystem, including the roles of microorganisms.
(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.