For humans and animals, the life-giving gas of the atmosphere is:
AOxygen
BMethane
CHelium
DAmmonia
Answer & Solution
Correct answer: A. Oxygen
1. The atmosphere holds a mixture of gases.
2. It contains life-giving oxygen for humans and animals.
3. Plants draw on carbon dioxide instead.
_Source: NCERT Class 11 Geography, 'Composition and Structure of Atmosphere' (kegy207)_
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