The lifespan of White Blood Cells is __________ days. A. 1 – 5 days B. 3 – 7 days C. 4 – 8 days D. 5 – 21 days Related Read more articles Previous PostEach day human body breathe in __________ liters of air Next PostDuring winter in cold countries, the __________ is mixed to melt the ice on the icy roads. If the aforementioned Answer is Wrong. Leave a Reply with an authentic source.Cancel reply