( ( On Earth ) ( today ( , ( ( most ( of ( ( life 's ) energy ) ) ) ( ( ( ( comes ( from ( the Sun ) ) ) , ) ( through photosynthesis ) ) . ) ) ) ) )
(ROOT (S (PP (IN On) (NP (NNP Earth))) (NP (NN today)) (, ,) (NP (NP (JJS most)) (PP (IN of) (NP (NP (NN life) (POS 's)) (NN energy)))) (VP (VBZ comes) (PP (IN from) (NP (DT the) (NNP Sun))) (, ,) (PP (IN through) (NP (NN photosynthesis)))) (. .)))
On Earth today, most of life's energy comes from the Sun, through photosynthesis.
(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)))) (. .)))