What are blood islands,and from which cells do they form?
A) Blood islands are primitive capillary networks formed from embryonic cells scattered within the yolk sac.
B) Blood islands are primitive arteries that are formed from hemangioblasts.
C) Blood islands are primitive veins that are formed from hemangioblasts.
D) Blood islands are aggregations of embryonic cells scattered within the yolk sac that form blood vessels and blood cells.
E) Blood islands are collections of blood cells that are formed from embryonic hematopoietic stem cells.
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