how did biosphere form?

The domain of earth that consists of living beings is known as the biosphere. It is the place where lithosphere, hydrosphere and atmosphere meet. The conditions at the meeting point of these domains are suitable to sustain life.

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"How did biosphere form?" is the same question as "THE structure of the biosphere and theory on how earth was formed?" 

This is really 2 questions. There is no connection between the structure of the biosphere and the theory(ies) of how the earth was formed; except perhaps in the most nebulour terms. Choose one question


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Biosphere is the narrow zone of contact between the land, water and air. 

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