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An experiment is conducted to examine the effects of a certain drug on rats. A pair of rats is housed in a cage. Suppose that

An experiment is conducted to examine the effects of a certain drug on rats. A pair of rats is housed in a cage. Suppose that the drug is to be given by injection. One drug treatment is assigned to one of the rats in a cage, while the other drug is assigned to the other rat. What is the experimental unit/subject?
a.The cage
b.The rats
c.The drug
d.None of the above

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