( ( ( ( ( Carbon dimer ) , ) ( the ( small-est ( all-carbon molecule ) ) ) ) , ) ( ( ( ( is ( extremely reactive ) ) and ) ( can ( ( give rise ) ( to ( ( complex chemistries ) ( involving ( ( ( H ( , ( O ( , ( N , ) ) ) ) ) and ) ( other elements ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Carbon) (NNP dimer)) (, ,) (NP (DT the) (JJ small-est) (JJ all-carbon) (NN molecule)) (, ,)) (VP (VP (VBZ is) (ADJP (RB extremely) (JJ reactive))) (CC and) (VP (MD can) (VP (VB give) (NP (NN rise)) (PP (TO to) (NP (NP (JJ complex) (NNS chemistries)) (PP (VBG involving) (NP (NP (NNP H) (, ,) (NNP O) (, ,) (NNP N) (, ,)) (CC and) (NP (JJ other) (NNS elements))))))))) (. .)))
Carbon dimer, the small-est all-carbon molecule, is extremely reactive and can give rise to complex chemistries involving H, O, N, and other elements.
(ROOT (S (NP (DT The) (NN element) (NN carbon)) (VP (VBZ is) (ADJP (JJ present) (PP (IN in) (NP (DT all) (JJ organic) (NNS molecules))))) (. .)))
The element carbon is present in all organic molecules.