<u>Answer:</u>
Glastulla:
This blastula implants into uterus called glastulla.
Embryo:
Glastulla cells begins to differentiate and develops into embryo.
<u>Explanation:</u>
Human Development:
Human Development takes about 266 days which is around 9 months. In this time fertilized egg develops in to baby. This whole development is divided into three trimesters lasting about three months each.
Fertilization:
Ovum female sex cell fertilized with sperm which is male sex cell.
Zygote:
After fertilization this cell is called zygote.
Morula:
Zygote divides and ball of cells called morula.
Blastocyst:
Morula develops into cells with hollow cavity called blastocyst.
Glastulla:
This blastula implants into uterus called glastulla.
Embryo:
Glastulla cells begins to differentiate and develops into embryo.
Fetus:
After eight weeks this embryo is considered as Fetus.