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Answer:

1. a catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

2. An enzyme is a substance that acts as a catalyst in living organisms, regulating the rate at which chemical reactions proceed without itself being altered in the process. The biological processes that occur within all living organisms are chemical reactions, and most are regulated by enzymes.

3. The biological processes that occur within all living organisms are chemical reactions, and most are regulated by enzymes. Without enzymes, many of these reactions would not take place at a perceptible rate. Enzymes catalyze all aspects of cell metabolism.

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Explanation:A catalyst is a chemical that speeds up chemical reactions. In organisms, catalysts are called enzymes. Enzymes help speed up chemical reactions in the human body.

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