Question

It takes 4-6 hours for morulla to descend into uterus

Answer 1

Eight-cell embryo (approximately 72 hoursafter insemination). The morula, a collection of around 30 cells (blastomere), is created atabout 96 hours. Because these cells arise only through the cleavage of the zygote and all are found inside the pellucid zone, which cannot expand, no growth is seen.