What are the two sources that form Placenta?
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Placenta is formed by two sets of minute finger like processes called the villi. One set of villi is from the uterine wall and the other set is from the allantois.
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The onset of menstruation in a human female is called:
Explain the function of corpus luteum when:
(a) ovum is fertilised.
(b) ovum is not fertilised.