The onset of menstruation in a human female is called:

In the absence of fertilization, the corpus luteum . . . . . . .

The hormone present in the greatest concentration during ovulation is

What are the phases of the menstrual cycle?

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
$\text{Menstrual cycle} \quad \quad \quad \text{Oestrous cycle}$

The cyclic period of sexual activity in non-human female mammals is called