An ecosystem is identified by a set of different characteristics that connect the animal kingdom with the plant kingdom, a specific environment in which each entity needs the other to coexist. That is to say, its life process is linked directly, and in an evolutionary way,to the living organisms that make it a home.
The Ecosystem can be thought of as a single unit containing living things and non-living things, and the living things interact with the non-living things and also with the environment, working as a system. The Ecosystem and its Components are thought of as entities in a limited, defined space – for e.g., a forest or an ocean. However, according to some scientists and ecologists, the entire planet is an ecosystem. Ecosystems are controlled by both internal and external factors. The external factors such as the climatic conditions define how the ecosystem works, but do not get affected by the ecosystem itself.