( ( Amino acids ) ( ( contain ( primarily ( carbon ( , ( hydrogen ( , ( oxygen ( and ( nitrogen atoms ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Amino) (NNS acids)) (VP (VBP contain) (PP (RB primarily) (NP (NN carbon) (, ,) (NN hydrogen) (, ,) (NN oxygen) (CC and) (NN nitrogen) (NNS atoms)))) (. .)))
Amino acids contain primarily carbon, hydrogen, oxygen and nitrogen atoms.
(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)))))))) (. .)))