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Which gas is most abundant in Earth's atmosphere?

AOxygen

BCarbon dioxide

CNitrogen

DHydrogen

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Correct Answer: C: Nitrogen

Explanation: Nitrogen (N₂) makes up ~78% of Earth's atmosphere. Oxygen: ~21%. Argon: ~0.93%. CO₂: ~0.04%. Nitrogen is essential for plant growth and is relatively inert chemically.

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