Inhibition of uterine contraction ceases and the bleeding and cramps of menstruation begin due to
Increase in level of progesterone
Decrease in level of progesterone
Increase in level of $LH$
Decrease in level of $FSH$
In human females at the time of birth there are two million ova: how many of them normally reach maturity in the course of normal reproductive life
Which type of placenta is present in the early human embryo?
Identify the odd one
Which of the following cannot pass through the placenta into the foetus
Meiosis can be observed in