( ( ( ( ( Pyramid ( ecosystem modeling ) ) ( ( can also ) ( be ( used ( to ( ( show ( energy flow ) ) ( through ( the ( trophic levels ) ) ) ) ) ) ) ) ) ; ) ( ( pyramids ( of energy ) ) ( ( ( are always ) ( upright ( since ( energy decreases ) ) ) ) ( at ( each ( trophic level ) ) ) ) ) ) . )
(ROOT (S (S (NP (NN Pyramid) (NN ecosystem) (NN modeling)) (VP (MD can) (ADVP (RB also)) (VP (VB be) (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)))))))))) (: ;) (S (NP (NP (NNS pyramids)) (PP (IN of) (NP (NN energy)))) (VP (VBP are) (ADVP (RB always)) (ADJP (JJ upright) (PP (IN since) (NP (NN energy) (NNS decreases)))) (PP (IN at) (NP (DT each) (JJ trophic) (NN level))))) (. .)))
Pyramid ecosystem modeling can also be used to show energy flow through the trophic levels; pyramids of energy are always upright since energy decreases at each trophic level.
(ROOT (S (NP (NNP Ecological) (NNS pyramids)) (VP (MD can) (VP (VB demonstrate) (NP (NP (DT the) (NN decrease)) (PP (IN in) (NP (NN energy) (, ,) (NNS biomass) (CC or) (NNS numbers)))) (PP (IN within) (NP (DT an) (NN ecosystem))))) (. .)))