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In this experiment, you compare several unknown powders to known powders. What is the name given to all of the known materials used for comparison in this experiment?
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In this experiment, you compare several unknown powders to known powders. What is the name given to all of the known materials used for comparison in this experiment?

User Moddaman
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The correct option is CONTROLS.
In scientific experiments, controls are groups which receive no treatments and which are used as standards to measure the behavior of other experimental subjects.
Comparison is usually made between control and all the other experimental groups.
User Barryred
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