Posted by mary on Wednesday, March 6, 2013 at 1:00pm.
independent variable affects the dependent and changes the outcome of the experiment. therefore the I.V. is what you CHANGE. D is the answer (paper plastic and glass have different insulation levels so this is what the experiment is testing)
You asked for the INDEPENDENT variable.
That variable isn't affected by anything.
I always remember a teacher telling me, that "time marches on" so nothing we do affects it.
Usually with a graph you will see time on the "x" axis.
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