I need this answer by today because it's for homework and if I answer this question then I will be done and I can go get something to eat and watch tv. :D|||Its so the other variables will not be messed up and your experiment will be conducted correctly because the control group is the one that stays the same|||The control is left alone so that the other variables may be compared to it. The control is the variable that is usually the "normal" result and that which you are testing against.
So basically you can compare the change in the dependent variable as a result of change in the independent variable.|||because if you do the experiment without controls you wont know if the resuklts are significant
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