( ( Many ( metabolized substances ) ) ( ( ( are compounds ) ( containing ( only ( ( ( ( ( ( the ( elements carbon ) ) , ) hydrogen ) , ) and ) oxygen ) ) ) ) . ) )
(ROOT (S (NP (JJ Many) (NN metabolized) (NNS substances)) (VP (VBP are) (ADVP (RB compounds)) (VP (VBG containing) (NP (RB only) (NP (DT the) (NNS elements) (NN carbon)) (, ,) (NP (NN hydrogen)) (, ,) (CC and) (NP (NN oxygen))))) (. .)))
Many metabolized substances are compounds containing only the elements carbon, hydrogen, and oxygen.
(ROOT (S (NP (NP (NNS Compounds)) (VP (VBG containing) (NP (DT the) (NN element) (NN carbon)))) (VP (VBP are) (NP (NP (DT the) (NN basis)) (PP (IN of) (NP (DT all) (VBN known) (NN life))))) (. .)))
Compounds containing the element carbon are the basis of all known life.