Onset of menstruation is due to

In girls, the first menstruation begins at puberty and is called .....

In the menstrual cycle,what is another name for the follicular phase?

Categorize the following animals into those exhibiting menstrual cycle and those exhibiting oestrous cycle.
$I -$ Monkeys,$II -$ Cows,$III -$ Sheep,$IV -$ Apes,$V -$ Humans,$VI -$ Rats,$VII -$ Deer,$VIII -$ Dogs,$IX -$ Tigers
$\text{Menstrual cycle} \quad \quad \quad \text{Oestrous cycle}$

On which day of the menstrual cycle does ovulation occur?

Which of the following is the correct pairing of events occurring during the menstrual cycle?