( ( ( The ( four ( major classes ) ) ) ( of ( organic molecules ) ) ) ( ( include ( ( ( ( ( ( ( ( ( ( carbohydrates , ) proteins ) , ) lipids ) and ) ( nucleic acids ) ) . ) ( These ( all ( contain carbon ) ) ) ) and ) ( ( ( a lot ) ( of ( organic molecules ) ) ) ( contain ( oxygen ( , ( ... ( ( ( phosphorus , ) or ) nitrogen ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (CD four) (JJ major) (NNS classes)) (PP (IN of) (NP (JJ organic) (NNS molecules)))) (VP (VBP include) (SBAR (S (S (FRAG (NP (NP (NNS carbohydrates)) (, ,) (NP (NNS proteins)) (, ,) (NP (NNS lipids)) (CC and) (NP (JJ nucleic) (NNS acids))) (. .)) (NP (DT These)) (VP (ADVP (DT all)) (VBP contain) (NP (NN carbon)))) (CC and) (S (NP (NP (DT a) (NN lot)) (PP (IN of) (NP (JJ organic) (NNS molecules)))) (VP (VBP contain) (SBAR (S (NP (NN oxygen)) (, ,) (: ...) (VP (VP (VBZ phosphorus)) (, ,) (CC or) (VP (VBZ nitrogen)))))))))) (. .)))
The four major classes of organic molecules include carbohydrates, proteins, lipids and nucleic acids. These all contain carbon and a lot of organic molecules contain oxygen, …phosphorus, or nitrogen.
(ROOT (S (NP (NNP Rna) (CC and) (NNP dna)) (VP (VBP are) (NP (NP (NNS types)) (PP (IN of) (NP (NP (JJ nucleic) (NNS acids)) (VP (VBG containing) (NP (NP (DT the) (NNS elements)) (NP (NN carbon) (, ,) (NN hydrogen) (, ,) (NN oxygen) (, ,) (NN nitrogen) (, ,) (CC and) (NN phosphorus)))))))) (. .)))