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oxygenAHK-sih-junnoun:: a gas that is necessary for life and forms about 21 percent of the atmosphere.

During photosynthesis, green plants use energy from sunlight to convert water, carbon dioxide, and minerals into oxygen and organic compounds.

india Updated: Feb 02, 2006 14:39 IST

PTI
Hindustantimes
         

First Published: Feb 02, 2006 12:07 IST

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