a. makes the experiment valid
b. is an additional replicate for statistical purposes
c. reduces the experimental errors
d. minimizes experimental inaccuracy
e. allows a standard of comparison for the experimental group|||E|||E. because the control group is the one that is like your basis of differentiating the experimebtal group from it|||E. It's the group you don't mess with so you can compare to see if your other variables had an effect.
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