Which is the correct order of developer of the human embryo

The initial stages of human embryogenesis.

8-cell embryo, at 3 days.

Blastocyst with an inner cell mass and trophoblast.

Trophoblast differentiation.

Histogenesis of the three germ layers.

Artificially colored - gestational sac, yolk sac and embryo (measuring 3 mm at 5 weeks)

Embryo attached to placenta in amniotic cavity.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.