Fill in the Blanks Pregnancy (D)Online version Fill in the gaps in the paragraph with the words above. by Sara Cipriano 1 move liquid ninth uterus embryo systems umbilical embryo blood fetus embryo cord birth organs placenta lining lungs endometrium sac seventh digestive amniotic grow First Trimester : The zygote begins to divide into several cells and an forms . The attaches to the of the uterus ( ) . The forms around the embryo . It is a membrane full of that protects the embryo . The placenta forms at this time . The is an organ that permits the exchange of substances between the mother's and the through the . Second Trimester : The embryo becomes a . It grows and all the begin to form inside . It starts to take on human form and begins to . Third Trimester : The fetus continues to and mature . After the month , the development of the body is complete , although the and are not yet mature . Around the month , the fetus engages with the head towards the opening of the , in preparation for .
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