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19. In the human urinary/excretory system, there are two: Check all that apply. A. nephrons B. ureters C. collecting ducts D.

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19) b)ureter and d)kidneys. (as urinary system has two kidneys each connected to one ureter)

20) e) all of these are antigens (as antigen is any foreign material that has ability to excite immune response)

21) b) it is reabsorbed in blood

22) e) basophils

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