Question

20 POINTS! Why is it important to use a controlled experiment?

A. So you can study many variables at once
B. So you can be certain of the link between the variables
C. So you do not need to have a manipulated variable
D. So you do not have to control the variables

Answer 1

B. So you can be certain of the link between the variables
that’s the answer

Answer 2

answer is B !!!

you have to know what youre doing