Biosphere is a region where all ecosystems are together and life exists.It is the fourth sphere of Earth.
The word biosphere is derived from the greek work"bios" meaning life and "sphaira" meaning sphere.
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The biosphere also known as the ecosphere is a worldwide sum of all ecosystems.It can also be termed the zone of life on Earth. The biosphere is the global ecological system integrating all living beings and their relationships, including their interaction with the elements of the litosphere, atmosphere, hydrosphere, etc 
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Biosphere is that part of the earth in which living organisms exists or which support life.
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