Final answer:
Adjacent cells make up each functional region for cellular service, allowing for a smooth transition of service as a mobile user moves.
Step-by-step explanation:
Each region covered by cellular service is broken down into adjacent cells. This is an example of a functional region, which is defined by a practical function within a specific area. In the case of cellular service, the function is to provide reliable communication within the range of a broadcast tower.
As a person moves, their mobile phone connection is transitioned smoothly from one cell to another based on the signal strength, allowing for continuous service across the functional region.
Functional regions can take various forms, including delivery areas for a newspaper or a pizza shop, the listening area for a radio station, or the shopping area for a mall. These regions function to serve specific services or needs within their boundaries. However, when the function that defines the region ceases, such as a newspaper going bankrupt, the functional region also ends.
Functional regions are defined by specific functions or services within an area and cease to exist when the function ends.