( ( Because ( they ( eat autotrophs ) ) ) ( , ( they ( ( ( ( are ( on ( ( the ( next ( trophic level ) ) ) ( up ( from them ) ) ) ) ) and ) ( are ( called ( primary consumers ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Because) (S (NP (PRP they)) (VP (VBP eat) (NP (NNS autotrophs))))) (, ,) (NP (PRP they)) (VP (VP (VBP are) (PP (IN on) (NP (NP (DT the) (JJ next) (JJ trophic) (NN level)) (ADVP (RB up) (PP (IN from) (NP (PRP them))))))) (CC and) (VP (VBP are) (VP (VBN called) (NP (JJ primary) (NNS consumers))))) (. .)))
Because they eat autotrophs, they are on the next trophic level up from them and are called primary consumers.
(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)))))))) (. .)))