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प्रश्न
State one method by which :
- Oxygen is added to air
- Carbon dioxide is added to air
- Oxygen is removed from the air
- Carbon dioxide is removed from the air
टीपा लिहा
उत्तर
- Photosynthesis by green plants
- Combustion of various compounds
- Respiration by living organisms
- Plants- during photosynthesis.
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