So during fertilization, the zygote begins to move. It undergoes the first mitotic division. And right about here, we form that marula, or the Morola. And what this morala consists of is these 32 identical cells that carry the same exact genetic information of which are of equal size. And eventually, as this structure moves its way and makes its way into the actual space of the uterus, it develops into the blastula via the process of blastulation. So this is this structure right here, and eventually what happens is five to eight days following fertilization, that blastula will implant itself onto the endometrium, the lining of that uterus that was prepared by the two hormones, estrogen as well as progesterone, that were released by the corpus luteum.