Compléter Pregnancy stagesVersion en ligne Fill in the blanks with words from the pregnancy stages par Miguel Angel Preciado Lopez 1 fluid embryo sac placenta amniotic 40 uterus Pregnancy blastocyst button Fertilization foetus cord belly amniotic umbilical zygote is the time from fertilization to birth . The time from fertilization to birth usually last weeks . takes place in one of the fallopian tubes . A sperm cell fuses with an ovum to form a . Cells divide to form a ball called a . When the ball of cells reaches the it attaches itself to the wall of the uterus . In the uterus , the develops . When all the organs are formed , the form is called the . The foetus grows in the , which protects it . The amniotic sac is filled with . The foetus is attached to the mother by the . The is the remains of the umbilical cord . The provides nutrients and oxygen , and removes waste products .
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