( They ( ( ( ( are ( referred ( to ( as ( secondary consumers ) ) ) ) ) and ) ( ( make up ) ( the ( third ( trophic level ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VP (VBP are) (VP (VBN referred) (PP (TO to) (NP (RB as) (JJ secondary) (NNS consumers))))) (CC and) (VP (VBP make) (PRT (RP up)) (NP (DT the) (JJ third) (JJ trophic) (NN level)))) (. .)))
They are referred to as secondary consumers and make up the 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)))))))) (. .)))