Exposition occurs in the first few scenes of act I, when the audience is introduced to Iago and Roderigo, the central villains of the story, and learns of Othello's promotion of Michael Cassio over Iago and of Othello's secret marriage to Desdemona. These two actions on Othello's part lead into the rising action.
<em> In a dramatic play, the exposition takes place at the beginning of the work — to set the tone, introduce characters and their relationships, establish the setting, and offer other information to help you understand the rest of the play. </em>
Explanation: The agent told the Jacob Family that Maple wood is ok then go ahead and tells the Miller family a different story means he or she has committed the act of Race/Color discrimination.
Contingency is the event that can be possible in the future but cannot be predicted.
So when the US occurs just as often without the tone as it does in the presence of the tone,then no conditioning will accure the tone.This suggests that the animals are sensitive to contingency.