( ( ( ( ( ( ( The ( energy pyramid ) ) ( describing ( trophic ( level relationships ) ) ) ) ( ( ca n't ) ( be inverted ) ) ) , ) but ) ( ( the ( biomass ( and ( numbers pyramids ) ) ) ) ( ( can , ) ( as ( seen ( in ( lecture 22 ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN energy) (NN pyramid)) (VP (VBG describing) (NP (JJ trophic) (NN level) (NNS relationships)))) (VP (MD ca) (RB n't) (VP (VB be) (VP (VBN inverted))))) (, ,) (CC but) (S (NP (DT the) (NNS biomass) (CC and) (NNS numbers) (NNS pyramids)) (VP (VP (MD can)) (, ,) (SBAR (IN as) (S (VP (VBN seen) (PP (IN in) (NP (NN lecture) (CD 22)))))))) (. .)))
The energy pyramid describing trophic level relationships can't be inverted, but the biomass and numbers pyramids can, as seen in lecture 22 .
(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))))) (. .)))