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  1. Urea - Wikipedia

  2. Urea | Definition, Formula, Production, Uses, & Facts | Britannica

  3. What Is Urea Made Of? How Is Urea Produced? - Science ABC

  4. Urea: what is it, symptoms and treatment | Top Doctors

  5. Urea - American Chemical Society

  6. BUN (Blood Urea Nitrogen) Test: Uses, Procedures, and Results

  7. Urea Cycle – Location, Steps, and Diagram - Science Facts

  8. Urea - CH4N2O Structure, Properties, and Uses - BYJU'S

  9. Urea (CH₄N₂O) - Definition, Structure, Preparation, Properties, …

  10. What is Urea? (with pictures) - AllTheScience