Specifically in a control group, the variable that is not changed is the blank variable? this is a open ended question and I need help with it

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A: ANSWER;-

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A:

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Intelligence

Intelligence refers to the intellectual functioning that compares a person's intelligence quotient (IQ) with other people of the same age. In other words, it is the ability to understand circumstances or situations and arrive at appropriate solutions. Both animals and plants exhibit intelligence.