The answer is yes
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If changes in one variable do not affect the outcome of another variable, then the second variable is independent. A variable that is not independent is dependent.
If you draw one out, replace it, and draw another out, it's independent. If you draw one out, DON'T replace it, and draw another out, it's dependent. (Similarly if you draw them both out at the same time.)
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Because otherwise it will not be possible to know whether observed variations in the dependent variable are due to one independent variable or another.
amount of light amount of water amount of force amount of heat etc.the variable that changes and the one that the dependent variable depends on to change