( ( ( The number ) ( of ( mouths food ) ) ) ( ( ( passes through ) ( in ( ( an ecosystem ) ( is ( determined ( ( ( ( by ( ( the size ) ( of ( an ecosystem ) ) ) ) , ) not ) ( by ( ( the amount ) ( of ( ( available ( food energy ) ) ( in ( the ecosystem ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NNS mouths) (NN food)))) (VP (VBZ passes) (PRT (RP through)) (SBAR (IN in) (S (NP (DT an) (NN ecosystem)) (VP (VBZ is) (VP (VBN determined) (PP (PP (IN by) (NP (NP (DT the) (NN size)) (PP (IN of) (NP (DT an) (NN ecosystem))))) (, ,) (RB not) (PP (IN by) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (JJ available) (NN food) (NN energy)) (PP (IN in) (NP (DT the) (NN ecosystem))))))))))))) (. .)))
The number of mouths food passes through in an ecosystem is determined by the size of an ecosystem, not by the amount of available food energy in the ecosystem.
(ROOT (S (NP (NP (DT The) (NN amount)) (PP (IN of) (NP (NP (NN food)) (ADJP (JJ available) (PP (IN in) (NP (DT the) (NN area))))))) (ADVP (RB best)) (VP (VBZ determines) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS wolves)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB live) (PP (IN in) (NP (DT an) (NN area))))))))))) (. .)))