What are the archenteron?
What are the blastopore?
Explain gastrulation?
What is the function of the yolk sac?
From which germ layer do blood cells originate? What are other organs and tissues made from that germ layer?
What is notochord?
How during gastrulation are the first two germ layers formed? Which are these germ layers?
Why can the allantois be considered an adaptation to terrestrial life?
What is the function of the vitellus in the vertebrate egg?
What are the functions of umbilical cord?
What are the main substances transferred from the mother to the fetus through the placenta and from the fetus to the mother?
What is the significance of placenta?
How are animals classified according to the germ layers present in their embryonic development?
Define polyembryony?
What are pericardium?