An ecosystem's a natural unit consisting of all plants, animals and micro-organisms (biotic factors) in an area functioning together with all of the physical (abiotic) factors of the environment. An ecosystem's a unit of interdependent organisms which share the same habitat. Ecosystems usually form a number of food webs which show the interdependence of the organisms within the ecosystem. Overview The term "ecosystem" was coined in 1930 by Roy Clapham to denote the combined physical and biolog… (More on Ecosystem)