menstruation - shedding of endometrium and bleeding, menopause - occurs within the ages of 46 to 50 years old, miscarriage - loss of pregnancy due to the decrease of progesterone, implantation - The blastocyst inserted and embed in the endometrium, placenta - is an organ connected to the foetus through the umbilical cord, impotency - occurs when a husband and wife are unable to conceive., growth - is an irreversible, permanent process, conjoined - type of twins develop when there is an incomplete division of the embryo, sigmoid - S-shaped curve, ecdysis - The moulting process of the exoskeleton ,

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