Ecosystem, the complex of living organisms, their physical environment, and all their interrelationships in a particular unit of space. An ecosystem can be categorized into its abiotic constituents, including minerals, climate, soil, water, and sunlight, and its biotic constituents, consisting of all living members.
The ecosystem does not occur alone. They are always in contact with the adjacent ecosystems. Their boundaries are not well defined and they may overlap. There are certain areas where their boundaries are well defined it includes the pond and land ecosystems. They have some.