Question

Julio rubs a balloon with a cloth and places the balloon next to his head. He uses another balloon and places it next to his head without rubbing a cloth against it. Select the control in Julio's experiment.

a.Both balloons he used in the experiment
b.The balloon that was not rubbed with a cloth
c.The balloon that was rubbed with a cloth
d.Placing the balloon next to his hair

Answer 1

Answer:

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Explanation:

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