A scientific investigation would always involve a dependent and an independent variable.
A scientific investigation would always involve a dependent and an independent variable. The dependent variable is the variable that we have to manipulate as we conduct the experiment while the dependent variable is the variable that changes as we manipulate the independent variable.
As such;
The independent variable is the mass of the paper
The dependent variable is the distance that the airplane travels
The control variable is the paper used to construct the airplanes
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