Menstrual cycles ceases : Menopase :: First menstruation begins :

Give scientific reasons : When male excites sexually epididymis wall shrinks / contracts.

$A$ : The first sign of growing foetus may be noticed by listening to the heart sound through the stethoscope.
$R$ : By the end of second month of pregnancy, the foetus develops limbs and digits.

The female rabbit is

The second maturation division of the mammalian ovum occurs