You want to do an experiment to see if what you drink before a race affects how quickly you run. What is the IV (independent variable)?

What you drink before a race

Explanation:

Whatever substance you want to drink does not depend on anything. How quickly you run can be affected by the substance you'll drink before a race. How quickly you run will be the dependent variable. The independent variable here is what you drink before a race

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme