What should be my control experiment?!? (1 Viewer)

yasminee96

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For the dotpoint on the effect of environment on phenotype, my experiment is that i would grow hydrangeas in both acidic and alkaline soil, and see the difference it makes.

Seems prettty straight forward however i have no idea as to what i should make the control?

I need to remove the independent variable, but how do i remove pH of soil? Would i just use neutral soil?

Please respond ASAP :)
 

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