* Blastocyst free-floating within the Uterus, totally dependent on the Uterine environment for survival.
* Blastocyst free-floating within the Uterus, totally dependent on the Uterine environment for survival.
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[[Image:Pre Implantation Development.jpg|left|thumb|250px|<small><center> Schematic showing Development of the Morula and Blastocyst. (Courtesy of Pathways to Pregnancy and Parturition, Senger)</center></small>]]