I believe it is D) Cortisol
The following were required;
- Dependent Variable - productivity of workers
- Independent Variable - drinking the special juice
- Control group - Group B
<h3>What is a variable?</h3>
A variable is a measurable quantity that changes in an experiment. The variable that is manipulated in the experiment is called the independent variable.
Now these are the variables that are involved in this experiment:
- Dependent Variable - productivity of workers
- Independent Variable - drinking the special juice
- Control group - Group B
Learn more about experiment variable:brainly.com/question/16550062?
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Answer:
It is possible for two of the same species to have differences in their DNA.
Epithelial tissue I think this is correct