Explain why photosynthesis is considered the most important process in the biosphere.

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Photosynthesis is considered to be the most important process in the biosphere due to following reasons: 

1. Photosynthesis is the biochemical process through which all plants (primary producers) produce food. 

2. It is responsible for release of oxygen in the atmosphere. 

3. Heterotrophs are directly or indirectly dependent on autotrophs for energy and other related resources. Therefore, photosynthesis is considered the most important process in the biosphere.

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