Answer:
conditiond stimulus
Explanation:¨Professor Kariag is turning off the projector to signal that there will be a quiz, so he is making it the conditioned stimulus.
Students experienced it previously so many times that they became aware that the signal means that a hard quiz was to come thereafter.
The act of just turning off the projector could have occurred at random , and that originally was just another neutral stimulus. After a neutral stimulus is paired with the doing of a quiz, a conditioned response is formed as well:
Students begin already to feel anxious.
The 18th Amendment called for the banning of the manufacture, sale, or transportation of alcoholic beverages. The Eighteenth Amendment is the only Amendment to ever have been repealed from the United States Constitution–via the inclusion of the Twenty-First Amendment.
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