( ( ( Organisms ( that ( ( can not ) ( make ( their ( own food ) ) ) ) ) ) ( -LRB- ( heterotrophs -RRB- ) ) ) ( ( must ( rely ( on ( ( plants ( -LRB- ( autotrophs -RRB- ) ) ) ( for food ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNS Organisms)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB make) (NP (PRP$ their) (JJ own) (NN food))))))) (PRN (-LRB- -LRB-) (NP (NNS heterotrophs)) (-RRB- -RRB-))) (VP (MD must) (VP (VB rely) (PP (IN on) (NP (NP (NP (NNS plants)) (PRN (-LRB- -LRB-) (NP (NNS autotrophs)) (-RRB- -RRB-))) (PP (IN for) (NP (NN food))))))) (. .)))
Organisms that cannot make their own food (heterotrophs) must rely on plants (autotrophs) for 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)))))))))