Cleavage in the mammalian egg is $.........$.

The $Oestrus$ cycle is a characteristic of which of the following?

Explain the primary concept of the male and female reproductive systems.

$A$: After menopause,the levels of blood gonadotropins rise markedly.
$R$: At the time of menopause,all the ovarian follicles are converted into follicular atresia,and the ovaries do not respond to the gonadotropins.

What is the cause of pseudopregnancy?

Choose the correct option for human reproduction.