The branch of science which deals with the study of interaction among living organisms is known as Ecology. It includes both intra species interactions and interspecies interactions and also the relationship shared by organisms with their respective chemical and physical environment. These arrangements of relationships have developed naturally along with the evolution. An ecosystem has got different levels and it’s directly associated with the formation of life. Without a suitable environment an organism or a particular species cannot survive in a particular place. With evolution the ecosystem may have been changed a bit but drastic changes can never be witnessed and the process is a very ancient one. From years the living organisms are evolving and at present the procedure is still a continuous one. A fixed state can never be achieved as organism evolve according to change of the environment.

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