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| Description: The egg has a calcium-hardened shell that encloses the embryo and four characteristic amniote membranes (yolk sac, amnion, chorion, and allantois).
Picture Stats: Views: 280 Filesize: 151.47kB Height: 996 Width: 1500 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48039 Keywords: Anatomy |