( ( ( The ( ultimate source ) ) ( of ( energy ( for ( ( most living ) organisms ) ) ) ) ) ( ( is ( the sun ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ ultimate) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN for) (NP (ADJP (RBS most) (JJ living)) (NNS organisms)))))) (VP (VBZ is) (NP (DT the) (NN sun))) (. .)))
The ultimate source of energy for most living organisms is the sun.
(ROOT (S (ADVP (RB Ultimately)) (, ,) (NP (JJS most) (NN life) (NNS forms)) (VP (VBP get) (NP (PRP$ their) (NN energy)) (PP (IN from) (NP (DT the) (NN sun)))) (. .)))