( ( Differentiate ( among ( pyramids ( of ( numbers ( , ( biomass ( , ( and energy ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Differentiate) (PP (IN among) (NP (NP (NNS pyramids)) (PP (IN of) (NP (NNS numbers) (, ,) (NNS biomass) (, ,) (CC and) (NN energy)))))) (. .)))
Differentiate among pyramids of numbers, biomass, and energy.
(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))))) (. .)))