Write the role of primary germ layers in foetal development.

Formation of primary germ layers in an embryo.

Write on the role of parathyroid gland?

Write three roles of insulin.

Write the role of oestrogen in ovulation

Name the three primary germ layers of embryo. Also mention any three organs or organ systems developing from each layer.

Name the germ layers.

Write the role of the hormone oxytocin.