( ( ( Describe ( ( the roles ) ( of ( primary ( producers ( , ( herbivores ( , ( carnivores ( , ( decomposers ( , ( parasites ( , ( and ( mutualistic organisms ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ( in ( ( the ( energy ( flow ( and ( nutrient cycling ) ) ) ) ) ( of ( an ecosystem ) ) ) ) ) . )
(ROOT (S (VP (VB Describe) (NP (NP (DT the) (NNS roles)) (PP (IN of) (NP (JJ primary) (NNS producers) (, ,) (NNS herbivores) (, ,) (NNS carnivores) (, ,) (NNS decomposers) (, ,) (NNS parasites) (, ,) (CC and) (NN mutualistic) (NNS organisms)))) (PP (IN in) (NP (NP (DT the) (NN energy) (NN flow) (CC and) (NN nutrient) (NN cycling)) (PP (IN of) (NP (DT an) (NN ecosystem)))))) (. .)))
Describe the roles of primary producers, herbivores, carnivores, decomposers, parasites, and mutualistic organisms in the energy flow and nutrient cycling of an ecosystem.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN carnivore)) (VP (VBZ is) (PP (IN at) (NP (NP (DT the) (NN top)) (PP (IN of) (NP (DT the) (NN energy) (NN pyramid)))))) (. .)))