Which variable do you change during an experiment? This is often associated with the IF part of the hypothesis. Constant Variable
Control Variable
Independent Variable
Dependent Variable
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Independant variable

Explanation:

Say you were doing a lab, you wanted to know if fertilizer actually helped a plant grow. The growth of a plant, in this situation, depends on whether you use fertilizer or not. You are changing if you use it or not, so it is the independent variable.  

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