( ( ( The ( sun 's ) ) energy ) ( ( is ( produced ( at ( its center ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN sun) (POS 's)) (NN energy)) (VP (VBZ is) (VP (VBN produced) (PP (IN at) (NP (PRP$ its) (NN center))))) (. .)))
The sun's energy is produced at its center.
(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)))) (. .)))