( ( ( secondary consumers ) ( -LRB- ( ( carnivorous ( zooplankton ( or ( planktivorous fish ) ) ) ) -RRB- ) ) ) ( third ( trophic level ) ) )
(ROOT (NP (NP (JJ secondary) (NNS consumers)) (PRN (-LRB- -LRB-) (NP (JJ carnivorous) (NN zooplankton) (CC or) (NN planktivorous) (NN fish)) (-RRB- -RRB-)) (NP (JJ third) (JJ trophic) (NN level))))
secondary consumers (carnivorous zooplankton or planktivorous fish) third trophic level
(ROOT (S (NP (NP (JJ Secondary) (NNS consumers)) (PRN (-LRB- -LRB-) (SBAR (WHNP (WDT which)) (S (VP (VBP eat) (NP (JJ primary) (NNS consumers))))) (-RRB- -RRB-))) (VP (VBP are) (VP (VBN considered) (S (VP (TO to) (VP (VB be) (ADJP (JJ trophic) (NP (NN level) (CD 3)))))))) (. .)))