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In which type of animals does the placenta exist?
What is gastrulation? How during gastrulation are the &rst two germ layers formed? Which are these germ layers?
To which structures do coeloms give birth? Are all animals coelomate?
How are animals classified according to the germ layers present in their embryonic development?
What are histogenesis and organogenesis?
What are extra embryonic membranes? Name these layers in vertebrates?
What is the chorioallantois membrane present in the embryonic development of reptiles and birds? How does this membrane participate in the energetic metabolism of the embryo?
What is placenta? What are its functions?
What is the significance of placenta?
What are the archenteron and the blastopore? What is the stage of the embryonic development in which these structures are formed?
What is the function of the vitellus in the vertebrate egg? How are these eggs classified according to the amount of vitellus within them?
What are somites?
What stage follows gastrulation?
After the morula stage what is the next stage?
What are the archenteron?
