What are the archenteron and the blastopore?
What is the function of the umbilical cord?
Why can the allantois be considered an adaptation to terrestrial life?
What are pleura, pericardium, and peritoneum?
From which germ layer do the epidermis and the nervous system originate?
From which germ layer do blood cells originate?
How is the notochord structure formed?
Classify the animals based on the germ layers in their embryonic development?
Explain coeloms.
How is the yolk sac formed?
Explain blastopore?
How notochord structure id formed?
What stage follows gastrulation?
When are archenteron and blastopore formed?
In which type of animals does the placenta exist? What is its main function?