Original sentence: Competition is a term widely used in several fields, including biochemistry, ecology, economics, politics, and sports.Competition is the act of striving against another force for the purpose of achieving dominance or attaining a reward or goal.Competition may be between two or more life forces or groups
Edited sentence: Competition characterises various activities, including biochemical, ecological,  economic, political, or sporting, where two or more agents, forces, systems, life forms, individuals or groups strive either for dominance or for some reward.Such rewards could consist of: