( ( ( 2.1.4 -- ) ( 1,2,3 ( ( ( ( Explain ( ( the principles ) ( of ( pyramids ( of ( numbers ( , ( biomass ( , ( ( energy and ) productivity ) ) ) ) ) ) ) ) ) ) , ) and ) ( be ( able ( to ( ( construct them ) ( from ( given data ) ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (CD 2.1.4)) (: --) (S (NP (CD 1,2,3)) (VP (VP (VB Explain) (NP (NP (DT the) (NNS principles)) (PP (IN of) (NP (NP (NNS pyramids)) (PP (IN of) (NP (NNS numbers) (, ,) (NNS biomass) (, ,) (NN energy) (CC and) (NN productivity))))))) (, ,) (CC and) (VP (VB be) (ADJP (JJ able) (S (VP (TO to) (VP (VB construct) (NP (PRP them)) (PP (IN from) (NP (VBN given) (NNS data)))))))))) (. .)))
2.1.4 ---1,2,3 Explain the principles of pyramids of numbers, biomass, energy and productivity, and be able to construct them from given data.
(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))))) (. .)))