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PLEASE HELP! HURRY! When we say that an experiment is controlled, we mean that __. A.) the outcome is certain B.) the theory has already been supported C.) there is only one theory being tested by the
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PLEASE HELP! HURRY!

When we say that an experiment is controlled, we mean that __.

A.) the outcome is certain
B.) the theory has already been supported
C.) there is only one theory being tested by the experiment
D.) there is only one difference between experimental groups

User Doug Knowles
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D. There is only one difference between experimental groups
User Julien Berthoud
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