Several days into the germinal stage, the cell mass takes the form of a fluid-filled ball of cells, which is called a

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By several days into the germinal stage, the zygote has undergone multiple cell divisions and developed into a fluid-filled ball of cells known as the blastocyst. A follicle is a structure in the ovaries that contains an immature egg, a morula is an earlier stage of development when the cell mass is still a solid ball of cells, and zygote is the initial single cell formed by the fusion of sperm and egg.

Several Days into the Germinal Stage, the Cell Mass Takes