(D) The $Yolk$ $sac$ is the primary site of early haematopoiesis (blood cell formation) in the human embryo before the liver and bone marrow take over

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(D) The $Yolk$ $sac$ is the primary site of early haematopoiesis (blood cell formation) in the human embryo before the liver and bone marrow take over this function. While it is non-functional for nutrition in humans,it serves this critical role in early development.