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Answer:
An engine or motor is a machine designed to convert one form of energy into mechanical energy. Heat engines convert heat into work via various thermodynamic processes.
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The term that best fit the blank is RELEVANCE. The Google Adwords system is a system that is created by Google for the purpose of advertising online. Therefore, relevance is very important in this aspect as this shows how useful the ad is to the consumers who are doing the google search.
