why statement best descibes why controls are necessary in an experiment? A. To rule out other posibble explanations for the results B. to make sure there are environmental changes present C. to show more growth is the control than with variables. D Controls aren't necessary but are merely options of an experimet.

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anonymous · Answer

When you run an experiment, you want to determine the normal growth or normal patterns. That way you can tell if the variables actually cause change. So you would want to use a control in every experiment to explain unexpected results. So I would think A