Chapter 4 Pg. 318 Facility, Product, Batch and Unit Levels. Would you please explain in great detail the different levels and the role they play, and provide examples for each, good examples please....

Chapter 4     Pg. 318

Facility, Product, Batch and Unit Levels.

Would you please explain in great detail the different levels and the role they play, and provide examples for each, good examples please.  Also, there is a question below about utilities that I need answered.  Please give GREAT examples for each level.

Also what would utitilies for the facility fall under? Which of the 4 categories