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प्रश्न
Choose the correct answer.
21 per cent of the atmosphere is composed of
विकल्प
Helium
Oxygen
Nitrogen
Hydrogen
MCQ
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उत्तर
Oxygen
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
Choose the correct answer.
21 per cent of the atmosphere is composed of
Helium
Oxygen
Nitrogen
Hydrogen
Oxygen