Where does the formation of the zygote occur during fertilization in rabbits?

The $Zona$ $pellucida$ of a mammalian egg serves which of the following purposes?

Following are some events occurring during the fertilization process. Arrange the $CORRECT$ sequence of events and choose the option given below.
$i$. Fertilizin-antifertilizin reaction.
$ii$. Cortical reaction.
$iii$. Acrosome reaction.
$iv$. Karyogamy.
$v$. Capacitation of sperms.

Where does the process of cleavage begin in humans?

Identical twins are produced when

Statement-$I$: The trophoblast layer gets attached to the endometrium and the inner cell mass gets differentiated as the embryo.
Statement-$II$: The morula becomes embedded in the endometrium of the uterus.