After the implantation of the zygote, as the ball of cells begins to differentiate, the inner cell mass becomes the

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The inner cell mass, which forms about 5-6 days after fertilization, becomes the embryo. The fetus develops later in pregnancy, after many organs and systems have already formed. The gametes (sperm and egg) already combined to form the zygote at fertilization, and the support system (placenta, umbilical cord, etc.) develops later to nourish and support the developing embryo/fetus.

After the Implantation of the Zygote, as the Ball of Cells