( ( Carbon ( dioxide molecules ) ) ( ( ( are not ) ( all ( the same ) ) ) . ) )
(ROOT (S (NP (NNP Carbon) (NN dioxide) (NNS molecules)) (VP (VBP are) (RB not) (ADVP (PDT all) (DT the) (JJ same))) (. .)))
Carbon dioxide molecules are not all the same.
(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.