Biosphere is defined as that part of the earth and atmosphere in which many smaller ecosystems exist and operate. Three main subdivisions of the biosphere are lithosphere (solid matter); hydrosphere (liquid matter), and atmosphere or the gaseous envelope of the earth which extends up to a height of 22.5 km.
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Complete information on the structure and functions of Biosphere
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Biosphere is the highest level of organisation. It consists of all the living organisms of world along with their physical environment. Before we try to understand biosphere, let us first recall the terms like organism, population, biotic community, ecosystem and biome.