Kendra is researching the effects of vitamin c on test-taking ability. before the exam, kendra gives group a orange juice, and group b water. vitamin c is the
a. experimental group. b. dependent variable. c. control group. d. independent variable.

D. Independent variable.

Explanation:

In research, we have two different types of variables:

In this example, Kendra will research the effects of vitamin C on test-taking ability. We can see that vitamin C will have an effect on the ability of taking tests and Kendra can control this variable by giving orange juice (or not) to the different groups. Therefore, vitamin C is the d. independent variable

answer; dr.black,who allows only certain individuals to mate;

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