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

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.

We have to do both the table?? And we have to do bar graph?? Can you say please Because the question you mention is not in detail.. ☺️