Onset of menstruation is due to

What is the other name for the follicular phase in the menstrual cycle?

Provide definitions/explanations for the following terms:
$(1)$ Menstrual cycle
$(2)$ Foetus

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

In the uterus,which hormone is responsible for the proliferation of the endometrium?

The average age at which human females reach menopause is............ (in $years$)