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The process by which the amount of nitrogen in the atmosphere stays constant is known as the

  • A.fermentation
  • B.carbon cycle
  • C.nitrogen cycle
  • D.photosynthesis

Answer: C

Correct answer: nitrogen cycle

The nitrogen cycle keeps atmospheric nitrogen roughly constant: fixation by bacteria and lightning removes N2 from the air, and denitrification returns it. The two processes balance, so the atmosphere stays at about 78% nitrogen.

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