What happens to most of the nitrogen in a plant when the plant dies?

Most of it follows its cycle, going back to the atmosphere.

The image below, shows you how the nitrogen cycle is.

Hope it helped,

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i think the answer is gold im not entirely sure

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.