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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 - American Chemical Society

  5. Urea | NH2CONH2 | CID 1176 - PubChem

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

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

  8. Urea - Encyclopedia.com

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

  10. Urea – Definition, Structure, Uses and Properties - Vedantu