( ( These organisms ) ( ( are carnivores ) . ) )
(ROOT (S (NP (DT These) (NNS organisms)) (VP (VBP are) (NP (NNS carnivores))) (. .)))
These organisms are carnivores .
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN carnivore)) (VP (VBZ is) (PP (IN at) (NP (NP (DT the) (NN top)) (PP (IN of) (NP (DT the) (NN energy) (NN pyramid)))))) (. .)))