Pregunta:
In the ____ and ____ (type of animal), the yolk sac is unimportant as a fetal membrane and it undergoes early regression, especially after formation of the ____. In the ____ and ____, the yolk sac is more important as it forms part of the (temporary) initial ____; it therefore also persists for a much longer period.
Autor: Magdalena BadenhorstRespuesta:
Ruminants and pig allantois horse and carnivores placenta
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