Answer:
A compass
Explanation:
A compass tells you which direction you are going whether that be North, East, South, or West. A map I'd a picture or drawing of a certain area.
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.
Please ask a school question next time please.