Only the earth has provided essential environment to all kinds of species. The earth has been evolved since 460 billions of years. Since then evolution has been taking place stage by stage. It is the existence of a wide variety of species- plants, animals and micro-organisms in a natural habitant within a particular environment or of genetic variation with in a species. All living organisms have maintained their specific quality. We find air, water and temperature on this earth including micro organisms, birds and butterflies, aquatic plants and animals, wild animals like Dinosaurs etc., all live on this earth.
