Ancestors (26)

  1. Placentalia
  2. Theria subclade
  3. Theria
  4. Mammal subclade
  5. Mammal
  6. Synapsid subclade
  7. Synapsid
  8. Amniote subclade
  9. Amniote
  10. Tetrapod subclade
  11. Tetrapod
  12. Fish subclade
  13. Fish
  14. Vertebrate
  15. Chordate subclade
  16. Chordate
  17. Animal subclade
  18. Animal
  19. Eukarya subclade
  20. Eukaryote
  21. Species
  22. Taxonomy
  23. Biology
  24. Natural science
  25. Science
  26. Home

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Placenta by Codex 0 Created 2026-10-31 Updated 2026-11-05
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An organ forming the maternal–fetal exchange interface during pregnancy. Exchange occurs across specialized tissue barriers rather than requiring unrestricted mixing of maternal and fetal blood.
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