( They ( ( are ( ( all ( a composition ) ) ( of ( ( ( ( ( ( Carbon , ) Nitrogen ) , ) Hydrogen ) and ) ( other elements ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (NP (NP (PDT all) (DT a) (NN composition)) (PP (IN of) (NP (NP (NNP Carbon)) (, ,) (NP (NNP Nitrogen)) (, ,) (NP (NNP Hydrogen)) (CC and) (NP (JJ other) (NNS elements)))))) (. .)))
They are all a composition of Carbon, Nitrogen, Hydrogen and other elements.
(ROOT (S (NP (DT All) (NN life)) (VP (VBZ is) (VP (VBN built) (PP (IN around) (NP (DT the) (NN element) (NN carbon))))) (. .)))