( ( All ( organic molecules ) ) ( ( have ( ( a ( carbon skeleton ) ) ( that ( is ( composed ( of ( ( ( rings or ) chains ) ( of carbons ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT All) (JJ organic) (NNS molecules)) (VP (VBP have) (NP (NP (DT a) (NN carbon) (NN skeleton)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (NNS rings) (CC or) (NNS chains)) (PP (IN of) (NP (NNS carbons))))))))))) (. .)))
All organic molecules have a carbon skeleton that is composed of rings or chains of carbons.
(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.