( ( Zooplankton ( which ( are ( ( ( ( the ( more animal-like ) ) ( of ( the plankters ) ) ) , ) ( -LRB- ( heterotrophs -RRB- ) ) ) ) ) ) ( ( ( can not ) ( ( ( ( produce ( their ( own food ) ) ) ( from ( the sun ) ) ) and ) ( therefore ( eat ( the phytoplankton ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Zooplankton)) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (NP (NP (DT the) (JJR more) (NN animal-like)) (PP (IN of) (NP (DT the) (NNS plankters))) (, ,) (PRN (-LRB- -LRB-) (NP (NNS heterotrophs)) (-RRB- -RRB-))))))) (VP (MD can) (RB not) (VP (VP (VB produce) (NP (PRP$ their) (JJ own) (NN food)) (PP (IN from) (NP (DT the) (NN sun)))) (CC and) (VP (ADVP (RB therefore)) (VB eat) (NP (DT the) (NN phytoplankton))))) (. .)))
Zooplankton which are the more animal-like of the plankters, (heterotrophs) can not produce their own food from the sun and therefore eat the phytoplankton.
(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)))))))))