( ( ( 5.2.1 Traces ) ( ( ( the flow ) ( of ( ( ( energy ( in ( an ecosystem ) ) ) , ) ( ( ( ( noting ( ( the dissipation ) ( of heat ) ) ) ( at ( each ( energy ( transfer point ) ) ) ) ) and ) ( discussing ( ( the impact ) ( on ( ( ( ( the ecosystem ) -LRB- ) e.g. ) , ) ) ) ) ) ) ) ) ( ( ( ( ( compares ( ( biomass and ) energy ) ) ( at ( ( different ( trophic levels ) ) ( in ( an ecosystem ) ) ) ) ) , ) and ) ( explains ( why ( they change ) ) ) ) ) ) ; )
(ROOT (NP (NP (NP (CD 5.2.1) (NNS Traces)) (SBAR (S (NP (NP (DT the) (NN flow)) (PP (IN of) (NP (NP (NN energy)) (PP (IN in) (NP (DT an) (NN ecosystem))) (, ,) (VP (VP (VBG noting) (NP (NP (DT the) (NN dissipation)) (PP (IN of) (NP (NN heat)))) (PP (IN at) (NP (DT each) (NN energy) (NN transfer) (NN point)))) (CC and) (VP (VBG discussing) (NP (NP (DT the) (NN impact)) (PP (IN on) (NP (NP (DT the) (NN ecosystem)) (-LRB- -LRB-) (NP (NNP e.g.)) (, ,))))))))) (VP (VP (VBZ compares) (NP (NNS biomass) (CC and) (NN energy)) (PP (IN at) (NP (NP (JJ different) (JJ trophic) (NNS levels)) (PP (IN in) (NP (DT an) (NN ecosystem)))))) (, ,) (CC and) (VP (VBZ explains) (SBAR (WHADVP (WRB why)) (S (NP (PRP they)) (VP (VBP change))))))))) (: ;)))
5.2.1 Traces the flow of energy in an ecosystem, noting the dissipation of heat at each energy transfer point and discussing the impact on the ecosystem (e.g., compares biomass and energy at different trophic levels in an ecosystem, and explains why they change;
(ROOT (S (NP (NN Pyramid) (NN ecosystem)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB show) (NP (NN energy) (NN flow)) (PP (IN through) (NP (DT the) (JJ trophic) (NNS levels)))))))) (. .)))
Pyramid ecosystem is used to show energy flow through the trophic levels.