1. Building subsystems are defined as a complete group of elements or set of parts that form and function as a unit within a finished building. One of which is the Plumbing System of a building. Provide a minimum of one paragraph narrating on how we, as engineers, can help lessen the overall impact of a building (specifically, impact of the plumbing system of a building) on the environment. 2. In your own words, provide a minimum of one paragraph explaining the importance of proper design of a plumbing system for a building (i.e residential, commercial etc.)