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| Description: Stage in which basic cell layers become differentiated. Major structures such as the head, heart, limbs, hands, and feet emerge. The embryo attaches to the placenta, the structure that allows for the exchange of oxygen and nutrients and the removal of wastes. Picture Stats: Views: 328 Filesize: 120.73kB Height: 312 Width: 203 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=23988 |