Final answer:
In the analogy between a cell and a city, FedEx represents the Golgi apparatus, which is responsible for processing and delivering proteins and lipids within a cell.
Step-by-step explanation:
In the analogy where a cell is compared to a city, FedEx would represent the Golgi apparatus. The Golgi apparatus in a cell is responsible for receiving, processing, and packaging proteins and lipids, similar to how FedEx receives, processes, and delivers packages in a city. Just like how FedEx ensures that packages reach their final destination, the Golgi apparatus ensures that proteins and lipids are properly sorted and directed to their final destinations within the cell.