Final answer:
The reaction involves carbon dioxide and water as substrates, which are converted into carbonic acid as the product. An enzyme, though not specified here, would facilitate this reaction.
Step-by-step explanation:
The reaction CO₂ + H₂O → H₂CO₃ involves the conversion of carbon dioxide and water into carbonic acid. In this reaction, the enzyme would be the biological catalyst that accelerates the reaction, although it is not explicitly mentioned which enzyme is involved here. The substrates in this reaction are carbon dioxide (CO₂) and water (H₂O), which the enzyme will act on. The product of the reaction is carbonic acid (H₂CO₃), which is formed through the enzyme's facilitation of the reaction.