sentence2_structure: organisms<>use<>catalysis<>to speed up reactions$$$organisms<>use catalysis to speed up<>reactions
sentence1: There is no organized society in Japan as far as homogeneous catalysis is concerned relating for example to metal complex catalysis, organic synthesis, catalytic chiral reaction and polymerization.
sentence2: Instead of heat, organisms use catalysis to speed up reactions.
question: Instead of heat, organisms use what to speed up reactions?