The tool being used is called a stamp or a roller
Melchior Broederlam was heavily influenced by the Trecento style of painting. Trecento style was created during the Renaissance era. It centers on the Italian culture.
Broederlam was able to demonstrate his style by making panel painting of the Christian culture. Broderlam was said to paint a panel painting of the Flight to Egypt, Presentation in Jerusalem and the Annunciation and the Visitation.
A) the number of hunger pangs a participant experiences.
Answer: So he knows how they respond to certain things, and knows how to better portray the message he's trying to send.