Kathy’s heart rate increases every time she goes down a certain hallway at school. The boy that she likes has a locker in that hallway, and he often stands beside his locker and talks with friends. In the preceding scenario, what is most likely the unconditioned stimulus?
a. Kathy’s heart rate
b. Kathy’s attraction for the boy
c. The hallway where the boy’s locker is located
d. The boy

What is the difference between a journal entry written by an eyewitness to an event and a play written about the same event? a. the journal entry is a historiographical source, while the play is a periodical source. b. the journal entry is a chronological source, while the play is a primary source. c. the journal entry is a primary source, while the play is a secondary source. d. the journal entry is a secondary source, while the play is a periodical source.