Why is nitrogen cycling on land far from zero balance?

S

solace

New member
a. Primarily because of differential transfers between land and ocean
b. Primarily because of the use of nitrogen fertilizers and legume crops
c. Primarily because of the large internal nitrogen cycling on land
d. Primarily because of the large internal nitrogen cycling in oceans
e. primarily because of sea level rise

Not sure if it's a, b, or c.
 
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