The period between $12$ and $18$ years of age in a person is known as adolescence.

In which of the following are megalecithal (macrolecithal) eggs found?

Consider the following:
$A.$ The reductive division for the human female gametogenesis starts earlier than that of the male gametogenesis.
$B.$ The gap between the first meiotic division and the second meiotic division is much shorter for males compared to females.
$C.$ The first polar body is associated with the formation of the primary oocyte.
$D.$ Luteinizing Hormone $(LH)$ surge leads to disintegration of the endometrium and onset of menstrual bleeding.
Choose the correct answer from the options given below:

Which of the following statements are correct regarding the female reproductive cycle?
$A$. In non-primate mammals,cyclical changes during reproduction are called the oestrus cycle.
$B$. The first menstrual cycle begins at puberty and is called menopause.
$C$. Lack of menstruation may be indicative of pregnancy.
$D$. Cyclic menstruation extends between menarche and menopause.
Choose the most appropriate answer from the options given below.

Choose the correct option for human reproduction.

Select the odd one out regarding the cells/layers associated with early embryonic development.