Final answer:
A system in physics is a defined space separated from its surroundings for focused study, such as in the case of a gyroscope or an ecosystem like a sagebrush steppe.
Explanation:
A system is a portion of space with defined boundaries that separate it from its surroundings. This allows us to study specific aspects without interference from external factors. For instance, in studying a rotating gyroscope or an ecosystem like a sagebrush steppe, isolation from vibrations and other elements helps focus on the system's characteristics.
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