A．To show the relationship between fearfulness and environment.
B．To give examples of animals that they aren't fearful.
C．To compare fear in mammals to fear in other animals.
D．To identify the nerves that control fear in certain animals.
A．They didn't use singers.
B．They gave free concerts.
C．They performed in small nightclubs.
D．They shortened the length of their performances.
A．To discuss one way it impacted jazz music.
B．To explain why the government reduced some taxes.
C．To describe a common theme in jazz music.
D．To discuss the popularity of certain jazz bands.