Select the correct image.
the images show the stages of human development. at which stage does cell differentiation start?

Image 2

Explanation:

It's where the cells begin dividing

Glastulla:

This blastula implants into uterus called glastulla.

Embryo:

Glastulla cells begins to differentiate and develops into embryo.

Explanation:

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.

bc blah

explanation:

bc blah

"d.) carbon dioxide and hydrogen sulfide"