( ( In ( these ecosystems ) ) ( , ( ( ( the organisms ) ( that ( ( provide ( ( the rest ) ( of ( the ( food web ) ) ) ) ) ( with energy ) ) ) ) ( ( ( ( use chemicals ) ( as ( the ( energy source ) ) ) ) ( to ( make ( ( sugars ( rather than ) ) sunlight ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT these) (NNS ecosystems))) (, ,) (NP (NP (DT the) (NNS organisms)) (SBAR (WHNP (WDT that)) (S (VP (VBP provide) (NP (NP (DT the) (NN rest)) (PP (IN of) (NP (DT the) (NN food) (NN web)))) (PP (IN with) (NP (NN energy))))))) (VP (VBP use) (NP (NNS chemicals)) (PP (IN as) (NP (DT the) (NN energy) (NN source))) (S (VP (TO to) (VP (VB make) (NP (NP (NNS sugars)) (CONJP (RB rather) (IN than)) (NP (NN sunlight))))))) (. .)))
In these ecosystems, the organisms that provide the rest of the food web with energy use chemicals as the energy source to make sugars rather than sunlight.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (NN food) (POS 's)) (NN chemical) (NN energy)))) (ADVP (RB ultimately)) (VP (VBZ comes) (PP (IN from) (NP (NN sunlight)))) (. .)))