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Nitrogen cycle illustrating the flow of nitrogen through the atmosphere, soil, plants, and animals.

Diagram showing the nitrogen cycle with labeled components including nitrogen in the air, bacteria in root nodules, amino acids and proteins in animals, nitrate ions, ammonium ions, and bacteria in soil.

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Final Answer:
1. Nitrogen gas (N₂)
2. Nitrites (NO₂⁻)
3. Nitrates (NO₃⁻)
4. Decomposers (or decomposing bacteria/fungi)
5. Ammonification
6. Death and waste (or excretion and dead matter)
7. Denitrifying bacteria

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