lactase and carbonic anhydrase are examples of what type of substance?\nsubstrate\nreactant\nproduct\nenzyme

Brief Explanations:

Lactase breaks down lactose and carbonic anhydrase catalyzes the interconversion of carbon dioxide and water. Both are biological catalysts known as enzymes. Substrates are what enzymes act on, reactants are starting - materials in a chemical reaction, and products are the results of a reaction.

Answer:

D. enzyme