Which of the following option is not correct about sexual reproduction
$(I)$ Gametes fuse to form the zygote
$(II)$ It is an elaborate, complex and fast process as compared to asexual reproduction
$(III)$ Offspring sare not identical to the parents
Only $I$
Only $II$
Only $III$
$I, II$ and $III$
Genetically identical progeny is produced when an individual
Identify $X$ and $Y$ from the given diagram
Why the chances of survival of young ones is greater in viviparous ?
Identify the given figure :
What is seen in zygote during embryogenesis ?