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The constant is the base example that does not have any type of manipulation done to it.

the control group would be the example that is manipulated in the same way that the other groups in the experiment are but without the addition of any of the reactants.

Imagine your experiment was seeing the results of water boiling times. your constant would be the pot of water at room temperature without heat, the control group would be the pot that is placed on the stove being heated, and the Experimental group would be the one that you add salt to. (the variable that is being tested)

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