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What is placentation?
The placentation, or arrangement of ovules within the ovary, is frequently of taxonomic value. Placentation is usually submarginal in a simple pistil (female sex organ).

Placentation refers to the formation, type and structure, or arrangement of placentas. The function of placentation is to transfer nutrients from maternal tissue to a growing embryo. Placentation is best known in pregnant female mammals (eutheria), but also occurs in other animals, eggs (yolk sac placentation) and flowering plants.


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