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Amnion
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The protective sack around a baby that is filled with [[fluid]].
==Key Stage 3==
===Meaning===
[[File:PregnancyDiagram.png|right|300px|thumb|A [[diagram]] of a [[foetus]] in the [[uterus]] including the [[Umbilical Cord]].]]
The [[amnion]] is a protective sack around the [[offspring]] in the [[uterus]] that is filled with [[fluid]] to protect the [[offspring]].