Key Words: Enzyme, Substrate, Reactant, Product, Catalyst, Biological, Reusable, Explanations: A chemical made in the body to aid digestion, The substance and enzyme acts upon, A substance which starts a chemical reaction, What is created at the end of a chemical reaction, A chemical that speeds up the rate of a chemical reaction, A substance made from a living thing, A substance that can be used more than once,

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