( ( ( The unit ) ( of ( measurement ( used ( to ( quantify energy ) ) ) ) ) ) ( ( was ( exclusively ( the calorie ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN unit)) (PP (IN of) (NP (NP (NN measurement)) (VP (VBN used) (S (VP (TO to) (VP (VB quantify) (NP (NN energy))))))))) (VP (VBD was) (ADVP (RB exclusively) (NP (DT the) (NN calorie)))) (. .)))
The unit of measurement used to quantify energy was exclusively the calorie .
(ROOT (S (NP (NP (DT Another) (NN unit)) (PP (IN of) (NP (NN energy))) (, ,) (VP (VBN used) (ADVP (RB widely)) (PP (IN in) (NP (NP (DT the) (NN health) (NNS professions)) (CC and) (NP (JJ everyday) (NN life))))) (, ,)) (VP (VBZ is) (ADJP (JJ calorie)) (PRN (-LRB- -LRB-) (NP (NN cal)) (-RRB- -RRB-))) (. ?)))