( Isotope ( - ( ( ( ratio ( mass spectrometers ) ) ( are ( particularly ( valuable ( for ( ( analyzing ( light elements ) ) ( like ( ( hydrogen ( , ( oxygen ( , ( and ( carbon , ) ) ) ) ) ) ( which ( ( just so ) ( happen ( to ( be ( ( the ( most ( common elements ) ) ) ( in ( living things ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (FRAG (NP (NNP Isotope)) (: -) (S (NP (NN ratio) (NN mass) (NNS spectrometers)) (VP (VBP are) (ADJP (RB particularly) (JJ valuable) (PP (IN for) (S (VP (VBG analyzing) (NP (JJ light) (NNS elements)) (PP (IN like) (NP (NP (NN hydrogen) (, ,) (NN oxygen) (, ,) (CC and) (NN carbon) (, ,)) (SBAR (WHNP (WDT which)) (S (ADVP (RB just) (RB so)) (VP (VBP happen) (S (VP (TO to) (VP (VB be) (NP (NP (DT the) (RBS most) (JJ common) (NNS elements)) (PP (IN in) (NP (VBG living) (NNS things)))))))))))))))))) (. .)))
Isotope- ratio mass spectrometers are particularly valuable for analyzing light elements like hydrogen, oxygen, and carbon, which just so happen to be the most common elements in living things.
(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))))) (. .)))