Answer:
Example: If you want to explore the effect of salt on a plant growth, the control group would be a set of plants not exposed to salt, while the experimental group would recive the salt treament, so you answer is control group.
<span>D. Orangeville, Mack. Comprehensive Studies: Palm Trees and Other Mediterranean
Plants. Chicago: Rectangle Press, 2012. Print.
E. Inkletter, Christine. "The Wonderful Mediterranean Palm Tree." Overseas
Science 20.2 (2012): 13–28. Print.
You can usually tell if a source is reputable by its publisher.
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