( ( ( The ( only source ) ) ( of ( energy ( for producers ) ) ) ) ( ( is ( the sun ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ only) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN for) (NP (NNS producers)))))) (VP (VBZ is) (NP (DT the) (NN sun))) (. .)))
The only source of energy for producers is the sun .
(ROOT (S (NP (NP (NNS Producers)) (PP (IN in) (NP (DT an) (NN ecosystem)))) (ADVP (RB generally)) (VP (VB get) (NP (PRP$ their) (NN energy)) (PP (IN from) (NP (DT the) (NN sun)))) (. .)))