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  1. Placenta: How it works, what's normal - Mayo Clinic

  2. Placenta - Wikipedia

  3. Placenta: Overview, Anatomy, Function & Complications - Cleveland Clinic

  4. What the Placenta Is and How It Forms During Pregnancy - What to Expect

  5. The placenta: What it is and how it works - BabyCenter

  6. Placenta - What Is It and How It Works - Biology Dictionary

  7. Placenta: anatomy and function - Kenhub

  8. Placenta: Its Role and Complications - Verywell Health

  9. What Is a Placenta? Types, Development, Complications - MedicineNet

  10. Placenta types, structure, function, development and …