( ( ( The ( most ( common elements ) ) ) ( of ( living things ) ) ) ( ( include ( ( ( ( ( ( ( carbon , ) hydrogen ) , ) nitrogen ) , ) and ) oxygen ) ) . ) )
(ROOT (S (NP (NP (DT The) (RBS most) (JJ common) (NNS elements)) (PP (IN of) (NP (VBG living) (NNS things)))) (VP (VBP include) (NP (NP (NN carbon)) (, ,) (NP (NN hydrogen)) (, ,) (NP (NN nitrogen)) (, ,) (CC and) (NP (NN oxygen)))) (. .)))
The most common elements of living things include carbon, hydrogen, nitrogen, and oxygen.
(ROOT (S (NP (DT The) (NN nitrogen) (NN cycle)) (VP (VBZ includes) (NP (NP (NN air)) (, ,) (NP (NN soil)) (, ,) (CC and) (NP (VBG living) (NNS things)))) (. .)))