What are the blastopore?

1

How is the neural tube formed? What is the embryonic origin of the nervous system in vertebrates?

1

What is gastrulation? How during gastrulation are the first two germ layers formed? Which are these germ layers?

5

How is the neural tube formed?

1

What is yolk sac? How is it formed?

1

What is notochord?

1

What is the cell division during the first stage of the embryonic development called? How is this stage characterized?

5

How yolk sac is formed?

1

To which structures do coeloms give birth?

1

To which structures do coeloms give birth? Are all animals coelomate?

1

What are the cells produced in the first stage of the embryonic development called?

5

What is the significance of placenta?

1

Nmae extra embryonic membranes layers in vertebrates?

1

What are the main substances transferred from the mother to the fetus through the placenta and from the fetus to the mother?

5

How is the yolk sac formed? What is the function of the yolk sac?

5