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(a) When and how does placenta develop in human females?
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(a) Development of placenta takes place after implantation.
(b) The placenta is connected to the embryo through an umbilical cord.
(c) The placenta can also act as an endocrine gland but only during pregnancy and produces some hormones like human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogen, progesterone, etc