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Which arrow on the illustration represent the largest reservoir of nitrogen on earth

User HansSnah
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The largest reservoir of Nitrogen on earth is THE ATMOSPHERE. Nitrogen found in the atmosphere is known to be the Dinitrogen gas (N₂), and it makes up as much as 78% of all the gases in the dry air (atmosphere).

So, whichever arrow points to the atmosphere is your right answer.
User Joshvito
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