( ( Activated carbon ) ( ( is ( ( the ( ( most common ) element ) ) ( in ( military ( gas masks ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Activated) (NN carbon)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN element)) (PP (IN in) (NP (JJ military) (NN gas) (NNS masks))))) (. .)))
Activated carbon is the most common element in military gas masks.
(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))))) (. .)))