Cooling element is a Subsystem of refrigerator while refrigerator is the system.
What is a Subsystem?
A subsystem is refer to one or an operating environment through which the system organize, coordinates and control the work flow and resource use. The system can consist of many subsystems, all operating independently of each other. Subsystems help to utilize resources well.
Therefore, Cooling element is a Subsystem of refrigerator while refrigerator is the system.
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