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What is gastrulation? How during gastrulation are the &rst two germ layers formed? Which are these germ layers?
When are archenteron and blastopore formed?
How is the mesoderm (third germ layer) of triploblastic animals formed?
What are the three types of germ layers that form tissues and organs in animals?
What is umbilical cord?
What are the blastopore?
What are pericardium?
What is the morphological feature that defines that stage?
In which type of animals does the placenta exist? What is its main function?
Which hormones are produced by placenta? What is their significance?
What is the significance of placenta?
Where do liver and pancreas originate from?
How does the embryo turn from gastrula into neurula?
Explain pericardium?
What are histogenesis and organogenesis?
