( ( ( The ( ultimate source ) ) ( of ( energy ( for ( life ( on Earth ) ) ) ) ) ) ( ( is ( the sun ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ ultimate) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN for) (NP (NP (NN life)) (PP (IN on) (NP (NNP Earth)))))))) (VP (VBZ is) (NP (DT the) (NN sun))) (. .)))
The ultimate source of energy for life on Earth 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)))) (. .)))