( ( In ( contrast ( to carbon ) ) ) ( , ( nitrogen ( ( is ( one ( of ( ( the ( most inert ) ) ( of ( ( elements while ) ( in ( the ( animal organism ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (NN contrast)) (PP (TO to) (NP (NN carbon))))) (, ,) (NP (NN nitrogen)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (JJS most) (NN inert)) (PP (IN of) (NP (NP (NNS elements) (NN while)) (PP (IN in) (NP (DT the) (NN animal) (NN organism))))))))) (. .)))
In  contrast to carbon, nitrogen is one of the most inert of elements while  in the animal organism.
(ROOT (S (NP (NNP Carbon)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (VBN found)) (NN element)) (PP (IN in) (NP (VBG living) (NNS organisms))))) (. .)))