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9. A system is a set of components that function and interact in some regular way. Examples are the human body, a river, an economy and the earth. -The input of a system is the energy resources, matter resources or information you put into a system, the throughput would be the amount of materials or energy or matter or information passing through a system or process and the output is the heat, waste and pollution, and goods and services that come out of the system. What you put in, what goes through, and what comes out of a system. -Scientific models are useful because sometimes actual large scale experiments cost too much or are impossible so models give us a variety of projections or scenarios of possible futures or outcomes based on different assumptions.
