( ( ( answers , ) ( positive ( and ( negative reactions ) ) ) ) . )
(ROOT (NP (NP (NNS answers)) (, ,) (NP (JJ positive) (CC and) (JJ negative) (NNS reactions)) (. .)))
answers, positive and negative reactions.
(ROOT (S (S (VP (VBZ Is) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (NP (NN reaction)) (PP (IN for) (NP (DT an) (JJ endothermic) (NN reaction)))))))) (VP (VBZ is) (ADJP (JJ positive))) (. .)))