All of the following are key elements of control for demonstrating cause and effect in an experiment EXCEPT ______.
A. random assignment of participants to groups
B. manipulation of variables that operate in an experiment
C. inclusion of a comparison or control group
D. exclusion of a comparison or control group
Answer: D
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Salvia acts as an agonist of opioid receptors
a. True b. False Indicate whether the statement is true or false
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A) enterprising B) fantasy C) realistic D) tentative
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