Yolk sac is a structure that has a short duration in intrauterine development and is an important site for early blood cell formation.
What is the yolk sac?
It is the bag that houses yolk inside and that allows the embryos of certain species to feed in the initial stages of development.
Due to this structure, the embryo receives oxygen and nutrients and can discard its waste, in the case of the human being, the yolk sac fulfills the functions of the circulatory system, until the internal circulation begins to develop.
Therefore, we can conclude that the yolk sac is a structure that has a short duration in intrauterine development and is an important site for early blood cell formation.
Learn more about the yolk sac here: https://brainly.com/question/9791345
