( ( ( ( Heterotrophs ( are ( ( the consumers ) ( of ( the ecosystem ) ) ) ) ) ; ) ( they ( ( can not ) ( make ( their ( own food ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Heterotrophs)) (VP (VBP are) (NP (NP (DT the) (NNS consumers)) (PP (IN of) (NP (DT the) (NN ecosystem)))))) (: ;) (S (NP (PRP they)) (VP (MD can) (RB not) (VP (VB make) (NP (PRP$ their) (JJ own) (NN food))))) (. .)))
Heterotrophs are the consumers of the ecosystem; they cannot make their own food.
(ROOT (S (NP (NNS Animals)) (VP (MD can) (RB not) (VP (VB produce) (NP (PRP$ their) (JJ own) (NN food)) (S (VP (VBG making) (S (NP (PRP them)) (ADJP (JJ heterotrophs)))))))))