zygote, the union of a spermatozoon and an ovum, embryo, when a zygote attaches itself to the uterine wall, placenta, the organ that develops during pregnancy to provide oxygen and nutrients to the embryo, umbilical cord, connects the placenta to the embryo in order to transport oxygen and nutrients, amniotic sac, it is filled with fluid and grows around the embryo to protect it, foetus, When the embryo has got human appearance, 40 weeks/9 months, the general duration of a human pregnancy.

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