In the pillbug experiment, the substance used as the control was SAND. The control in an experiment doesn't change by other variables.
What is an experimental control?
An experimental control can be defined as a substance/material that doesn't change by other variables during the experiment.
In consequence, the control element can be used to compare two or more outcomes in an experiment.
The comparison of the results (outcomes) in different experimental treatments is fundamental to confirm or reject a hypothesis.
Learn more about experimental control here:
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