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The process by which white blood cells move into and out of the blood vessels is called ... 34- Fragments of megakaryocytes which rupture into pieces and responsible for clotting? a- RBC. b- antibodies. c- platelets. d- WBC. ( ) 35- When oxygen levels are low, the _____ is ... b- high extracellular potassium (K+) ion concentrations. c ... ................
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