( ( Without ( ( the ( Sun 's ) ) energy ) ) ( ( ( most life ) ( on Earth ) ) ( ( would ( cease ( to exist ) ) ) . ) ) )
(ROOT (S (PP (IN Without) (NP (NP (DT the) (NNP Sun) (POS 's)) (NN energy))) (NP (NP (JJS most) (NN life)) (PP (IN on) (NP (NNP Earth)))) (VP (MD would) (VP (VB cease) (S (VP (TO to) (VP (VB exist)))))) (. .)))
Without the Sun's energy most life on Earth would cease to exist.
(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)))) (. .)))