What are the archenteron and the blastopore? What are the destinations of the archenteron and of the blastopore?
From which germ layer do the epidermis and the nervous system originate?
What is gastrulation? How during gastrulation are the first two germ layers formed?
What is coelom? Are all animals coelomate?
What is gastrulation?
How is the notochord structure formed?
What is gastrulation? How during gastrulation are the &rst two germ layers formed? Which are these germ layers?
Define polyembryony?
What are pericardium?
What is the main function of placenta?
How during gastrulation are the first two germ layers formed?
How notochord structure id formed?
What are pleura?
What are peritoneum?
What is the morphological feature that defines that stage?
