What is an ecosystem? Ecosystem, an abbreviation of âecological systemâ. It can be thought of as an assemblage of living organisms ( biotic community or biocoenosis) living together with their environment (biotope). It is a dynamic and complex unit. Urban ecological systems are characterized by complex interactions among social, economic, institutional, and environmental variables. These interactions generate complex human-dominated landscapes, which significantly influence the functioning of local and global earth ecosystems. Ecosystems can be of varied dimensions. Often they are separated by geographical barriers like mountains, deserts, oceans, else they can be isolated like rivers, lakes. These borders are never rigid, and ecosystems tend to blend into one another. So the whole earth can be viewed as a single ecosystem, or a river can be said to consist of a number of ecosystems. What are the elements of the ecosystem? Ecosystems are composed of a variety of abiotic and biotic components that function in an interrelated fashion. An ecosystem can be categorized ......

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