Concept:The term "ecosystem" was first introduced by the British ecologist Dr. A. G. Tansley in 1935.Explanation:An ecosystem includes all living organisms (plants, animals, microbes) and their non-living surroundings interacting together.Tansley defined the term to describe the integrated relationship between living communities and their physical environment.Later scientists like Odum and Wittaker contributed to ecology, but the word "ecosystem" originated with Tansley.