( ( In ( ( the ( elements common ) ) ( in ( living systems ) ) ) ) ( , ( ( both ( ( oxygen and ) nitrogen ) ) ( ( are electronegative ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (DT the) (NNS elements) (NN common)) (PP (IN in) (NP (VBG living) (NNS systems))))) (, ,) (NP (DT both) (NN oxygen) (CC and) (NN nitrogen)) (VP (VBP are) (ADJP (JJ electronegative))) (. .)))
In the elements common in living systems, both oxygen and nitrogen are electronegative.
(ROOT (S (NP (NNP Oxygen)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (DT the) (JJ second) (ADJP (RBS most) (JJ electronegative)) (NN element))))) (. .)))