( So ( ( the energy ) ( ( ( ( ( ( comes ( from ( the Sun ) ) ) , ) ( is ( ( ( stored ( -LRB- ( and ( used -RRB- ) ) ) ) ( by plants ) ) ( through photosynthesis ) ) ) ) , ) ( then ( by ( organisms ( which ( ( eat ( the plants ) ) ( and ( so on ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (IN So) (NP (DT the) (NN energy)) (VP (VP (VBZ comes) (PP (IN from) (NP (DT the) (NNP Sun)))) (, ,) (VP (VBZ is) (VP (VBN stored) (PRN (-LRB- -LRB-) (CC and) (VP (VBN used)) (-RRB- -RRB-)) (PP (IN by) (NP (NNS plants))) (PP (IN through) (NP (NN photosynthesis))))) (, ,) (PP (ADVP (RB then)) (IN by) (NP (NP (NNS organisms)) (SBAR (WHNP (WDT which)) (S (VP (VBP eat) (NP (DT the) (NNS plants)) (ADVP (CC and) (RB so) (IN on)))))))) (. .)))
So the energy comes from the Sun, is stored (and used) by plants through photosynthesis, then by organisms which eat the plants and so on.
(ROOT (S (PP (IN Over) (NP (NP (CD 90) (NN %)) (PP (IN of) (NP (DT the) (NN energy))))) (NP (PRP we)) (VP (VBP use) (SBAR (S (VP (VBZ comes) (ADVP (RB originally)) (PP (IN from) (NP (DT the) (NN sun))))))) (. .)))