What is the control and variables of a mold experiment?

What is the control and variables of a mold experiment?


to be more specific on the experiment all i did was get out a banana bread cheese n milk and left it out and checked it for mold everyday for 4 days.What is the control and variables of a mold experiment?
the control could be a sterile agar plate (http://en.wikipedia.org/wiki/Agar_plate)





the variables could be agar plates streaked with cheese/milk,etcWhat is the control and variables of a mold experiment?
you must have done it wrong because there's no hint of a control in your description.





a control is a way to figure out just what effects something has...


for example if your measure the usefulness of a fertilizer you would have two plants one that get the fertilizer one that dosn't, the one that dosn't is the control. it simulates what happens ';naturally';





the variables are all the different things that effect your results, like room humidity.
The control, was something that you knew would or would not grow mold. You didn't subject any one to anything different than the others, right, because that would effect those answers. The variable was the type of food that you left out. Hope it helps!