Answer to Question 1
developer
Rationale: The developer has two primary agents: phenidone and hydroquinone. Phenidone will create the lower densities and hydroquinone will create the higher densities. Collectively they are responsible for producing densities on the image.
Answer to Question 2
flexion and extension laterals
Rationale: Flexion and extension lateral images can be acquired to determine mobility of the neck post-injury or after surgery.