( ( Carbon dioxide ) ( ( is ( ( ( CO 2 ) , ) ( which ( means ( there ( is ( ( ( ( one atom ) ( of carbon ) ) and ) ( ( two atoms ) ( of ( oxygen ( in ( the molecule ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Carbon) (NN dioxide)) (VP (VBZ is) (NP (NP (NNP CO) (CD 2)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ means) (SBAR (S (NP (EX there)) (VP (VBZ is) (NP (NP (NP (CD one) (NN atom)) (PP (IN of) (NP (NN carbon)))) (CC and) (NP (NP (CD two) (NNS atoms)) (PP (IN of) (NP (NP (NN oxygen)) (PP (IN in) (NP (DT the) (NN molecule))))))))))))))) (. .)))
Carbon dioxide is CO 2 , which means there is one atom of carbon and two atoms of oxygen in the molecule.
(ROOT (S (NP (NNP Carbon) (NN dioxide) (NNS molecules)) (VP (VBP consist) (PP (IN of) (NP (NP (DT a) (JJ central) (NN carbon) (NN atom)) (VP (VBN bonded) (PP (TO to) (NP (CD two) (NN oxygen) (NNS atoms))))))) (. .)))