( ( CATALYSIS ( ( The ( defining property ) ) ( of ( all catalysts ) ) ) ) ( ( is ( that ( they ( ( increase ( ( the speed ) ( of ( a ( chemical reaction ) ) ) ) ) ( without ( ( ( being ( used up ) ) or ) ( appearing ( as ( one ( of ( ( the products ) ( of ( the reaction ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (S (VP (VBZ CATALYSIS) (NP (NP (DT The) (VBG defining) (NN property)) (PP (IN of) (NP (DT all) (NNS catalysts)))))) (VP (VBZ is) (SBAR (IN that) (S (NP (PRP they)) (VP (VBP increase) (NP (NP (DT the) (NN speed)) (PP (IN of) (NP (DT a) (NN chemical) (NN reaction)))) (PP (IN without) (S (VP (VP (VBG being) (VP (VBN used) (PRT (RP up)))) (CC or) (VP (VBG appearing) (PP (IN as) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (NNS products)) (PP (IN of) (NP (DT the) (NN reaction))))))))))))))) (. .)))
CATALYSIS The defining property of all catalysts is that they increase the speed of a chemical reaction without being used up or appearing as one of the products of the reaction.
(ROOT (S (PP (RB Instead) (IN of) (NP (NN heat))) (, ,) (NP (NNS organisms)) (VP (VBP use) (S (NP (NNS catalysis)) (VP (TO to) (VP (VB speed) (PRT (RP up)) (NP (NNS reactions)))))) (. .)))
Instead of heat, organisms use catalysis to speed up reactions.