eco·sys·tem 
/ˈi:koʊˌsɪstəm/ noun
plural eco·sys·tems /ˈi:koʊˌsɪstəm/ noun [count] : everything that exists in a particular environment ◊An ecosystem includes living things, such as plants and animals, and things that are not living, such as rocks, soil, sunlight, and water.
▪ the forest's ecosystem
▪ the forest's ecosystem
