During fetal development, blood cells may arise from tissue in the thymus, spleen, liver, and red bone marrow.

Name: During fetal development, blood cells may arise from tissue in the thymus, spleen, liver, and red bone marrow.
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During fetal development, blood cells originate not only from the red bone marrow but also from the liver, spleen, and in early stages, the thymus, as these organs serve as primary sites for hematopoiesis (the process of blood cell production) before birth.

During Fetal Development, Blood Cells May Arise from Tissue in the Thymus