( ( In ( an ecosystem ) ) ( heterotrophs ( ( are ( ( called consumers ) ( because ( they ( depend ( on others ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (DT an) (NN ecosystem))) (NP (NNS heterotrophs)) (VP (VBP are) (VP (VBN called) (NP (NNS consumers)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP depend) (PP (IN on) (NP (NNS others)))))))) (. .)))
In an ecosystem      heterotrophs are called consumers because they depend on others.
(ROOT (S (NP (NNS Heterotrophs)) (VP (VBZ is) (NP (NP (DT another) (NN name)) (PP (IN for) (NP (NNS consumers))))) (. .)))