Biology, 23.07.2019 04:00 Fireburntbudder
In humans, the yolk sac in humans, the yolk sac is the site of origin for blood cells and primordial germ cells is no longer a useful structure forms the human urinary bladder passes nutrients to the embryo after digesting the yolk mass
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In humans, the yolk sac in humans, the yolk sac is the site of origin for blood cells and primordi...
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