In which stage is blastocoele formed

Describe the process of implantation of embryo.

The third phase in the development of a mammal is

Where does fertilisation take place in human beings ? What changes occur in egg cell (ovum) during fertilisation ?

Assertion : In morula stage, cells divide without increase in size.

Reason : Zona pellucida remains undivided till cleavage is complete.

Cleavage is followed by which stage