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If more than one variable were changed, then the scientist won't know which variable caused the change observed.

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The experimentation keep one of the variable constant to analyze the effect not hindered by the other fluctuating variable.

What is an experimentation design?

An experimentation design can be given as the setup that has been planned with the variables and the constant for performing an experiment. The setup determines the conditions governing the result of the experiment.

Keeping  more than one thing variable in an experiment results in the formation of the cumulative effect on the result, and the variables can not be analyzed independently. Therefore, only one variable is kept constant in an experimentation.

Learn more about experimentation setup, here:

https://brainly.com/question/14332569

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