The Amnion reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Amnion

The amnion, also called the amniotic sac, is a tough but thin membrane which holds a developing fetus until shortly before birth.

Amphibianss do not have amniotic eggs. Mammals, birds, and reptiles do and are called amniotes.

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