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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