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My very best would be to be related to a quantity like myself; however I ought to be happy if I might have unrestrained intercourse with one lover. In another day's time, this mass of cells will "hatch" from its thin-walled sac. At this point, a few of the zygote's cells kind the placenta, while others form the growing embryo. Information encoded in the collective DNA of the egg and sperm cell instructs the zygote to continue its development into an embryo. Once a sperm cell penetrates the exterior of the egg, fertilization happens -- its DNA payload is delivered because the sperm is absorbed by the egg. If you're a sperm cell getting into the vagina, there's about a 1 in 250 million chance you will be the sperm cell that reaches the egg. The whole journey takes a number of days, throughout which the egg exists in an ideal surroundings that gives it with nutrients.