( ( ( ( ( ( The earth ) ( ( holds nitrogen ) ( as ( ( ( atmospheric ( nitrogen gas ) ) , ) ( ( fixed nitrogen ) ( in ( the soil ) ) ) ) ) ) ) , ) and ) ( nitrogenous ( compounds ( in organisms ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN earth)) (VP (VBZ holds) (NP (NN nitrogen)) (PP (IN as) (NP (NP (JJ atmospheric) (NN nitrogen) (NN gas)) (, ,) (NP (NP (VBN fixed) (NN nitrogen)) (PP (IN in) (NP (DT the) (NN soil)))))))) (, ,) (CC and) (S (NP (NNS nitrogenous)) (VP (VBZ compounds) (PP (IN in) (NP (NNS organisms))))) (. .)))
The earth holds nitrogen as atmospheric nitrogen gas, fixed nitrogen in the soil, and nitrogenous compounds in organisms.
(ROOT (S (NP (NN Nitrogen) (NN gas)) (VP (VBZ comprises) (NP (NP (QP (RB about) (NNS three-fourths))) (PP (IN of) (NP (NP (NN earth) (POS 's)) (NN atmosphere))))) (. .)))