Given a scientific question, generate a correct answer to it.

[EX Q]: What is the term for a substance that increases the rate of a chemical reaction but is not changed or used up in the reaction?
[EX A]: a catalyst

[EX Q]: What do stored fats provide our body with for later use?
[EX A]: energy

[EX Q]: Yeasts are single-celled fungi. about 1,000 species are recognized, but the most common species is saccharomyces cerevisiae, which is used in this?
[EX A]:
bread making