A physical system is the one that is characterized by the chosen system or the environment for the analysis, for example, the water in the lake is a sort of the physical system and thus they are categorized as natural system and hence they also include the animal digestive system, human-made physical system, and the other system that depend on the type of the energy they use.
Like the water cycle and the oxygen and the carbon cycle and hence are important s system if the natural environment and some other examples include the solar system and the ecological systems.
<u>Hence the example of the great barrier reefs and the current as of the physical systems as those if the man-made systems.</u>
