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==Key Stage 3=====Meaning===[[File:PregnancyDiagram.png|right|300px|thumb|A [[diagram]] of a [[foetus]] in the [[uterus]] including the [[placenta]].]]The [[placenta]] is a special [[organ]] found only in the [[uterus]] of [[pregnant]] [[Mammal|mammals]] that surrounds a baby in supplies [[nutrient]]s and [[oxygen]] to the [[uterusoffspring]] and removes waste from the offspring]].