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Atmosphere: the thin layer of air which surrounds the earth is called atmosphere,
atmos means vapour the word "atmosphere" is derived from Greek.this consists a large number of gases including oxygen,nitrogen,carbon dioxide,water vapour etc and dust particles.

biosphere: the realm of life including bacteria which live high up in the atmosphere or in deep oceans constitutes biosphere. bios means life biosphere is derived from the greek word bios.
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Biosphere:- The biosphere is the global sum of all ecosystems. It can also be termed as the zone of life on Earth, a closed system (apart from solar and cosmic radiator and heat from the interior of the Earth), and largely self-regulating.

atmosphere :- 
the envelope of gases surrounding the earth or another planet is called atmosphere.

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