Morula is a developmental stage
between the zygote and blastocyst
between the blastocyst and gastrula
between implantation and parturition.
The correct option is D between the zygote and blastocyst
After fertilisation, zygote is formed. Zygote undergoes, mitotic divisions, called cleavage, to form 2, 4, 8 and 16 daughter cells called blastomeres. These divisions start when zygote is moving towards uterus. It is called morula at 8-16 cell stage and it continues to divide to form blastocyst.