What are extra embryonic membranes?
What is gastrulation? How during gastrulation are the first two germ layers formed? Which are these germ layers?
What is the difference between amnion and chorion?
What are peritoneum?
What are the archenteron and the blastopore? What is the stage of the embryonic development in which these structures are formed? What are the destinations of the archenteron and of the blastopore?
Explain gastrulation?
Explain notochord?
What is polyembryony?
What are the blastopore?
How is the yolk sac formed? What is the function of the yolk sac?
How is the yolk sac formed?
What is the morphological feature that defines that stage?
What is the significance of placenta?
When are archenteron and blastopore formed?
What is the embryonic origin of the nervous system in vertebrates?