( ( ( Describe ( ( the roles ) ( of ( primary ( producers ( , ( herbivores ( , ( carnivores ( , ( decomposers ( , ( parasites ( , ( and ( symbiotic 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) (NNP symbiotic) (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 symbiotic 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)))))) (. .)))