A Portuguese man-of-war is an example of C. a hydrozoan colony.
Explanation is in a file.
Answer:
a. The initial concentration of the substrate
Explanation:
If the researcher keeps the initial concentration of the substrate constant, it will give room to compare the reaction rates under different environmental conditions. The reaction rates will assist the researcher by providing the researcher with the necessary and important information about the enzyme's function in different environments.
Neutralizing waste would be your answer :)