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In an experiment what is the difference between a variable and a control and why are they BOTH necessary?

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In an experiment what is the difference between a variable and a control and why are they BOTH necessary?

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  1. The Control is an example of one that hasn't been messed with, for comparison with the one(s) that have been messed with in Variable ways.   Without a Control or control group, the experiment is deeply compromised as there is no accurate way of determining what happened. Regards, Larry.

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