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The placenta has been described as a pancake-shaped organ that attaches to the inside of the uterus and is connected to the fetus by the umbilical cord. The placenta produces pregnancy-related hormones, including chorionic gonadotropin (hCG), estrogen, and progesterone.
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The placenta and umbilical cord are different. Have a look.

The umbilical cord is the connection between mother and the baby, whereas the placenta is present around the baby.

The umbilical cord connects the fetus to placenta whereas the placenta links the fetus to the uterine wall.

The umbilical cord is the birth cord and on the other hand, the placenta is discarded after the delivery. 
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