( ( hydrocarbon ( ( A compound ) ( containing ( only ( the ( elements ( ( carbon and ) hydrogen ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB hydrocarbon) (NP (NP (DT A) (NN compound)) (VP (VBG containing) (NP (RB only) (DT the) (JJ elements) (NN carbon) (CC and) (NN hydrogen))))) (. .)))
hydrocarbon A compound containing only the elements carbon and hydrogen.
(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.