( ( A ( trophic level ) ) ( ( is ( ( ( a ( numerical level ) ) ( within ( a ( food ( chain ( or ( food web ) ) ) ) ) ) ) ( where ( ( an organism ) ( typically ( ( feeds or ) ( is consumed ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (JJ trophic) (NN level)) (VP (VBZ is) (NP (NP (DT a) (JJ numerical) (NN level)) (PP (IN within) (NP (DT a) (NN food) (NN chain) (CC or) (NN food) (NN web))) (SBAR (WHADVP (WRB where)) (S (NP (DT an) (NN organism)) (ADVP (RB typically)) (VP (VP (VBZ feeds)) (CC or) (VP (VBZ is) (VP (VBN consumed)))))))) (. .)))
A trophic level is a numerical level within a food chain or food web where an organism typically feeds or is consumed.
(ROOT (S (NP (NP (NN Loss)) (PP (IN of) (NP (NN energy)))) (VP (VBZ is) (NP (DT the) (NN reason)) (SBAR (IN that) (S (NP (NN food) (NN chain)) (ADVP (RB typically)) (VP (VBZ has) (NP (JJ few) (NNS levels)))))) (. .)))