The thymus:
(a) is the source of lymphocytes before birth and enables lymphocytes to develop into T cells
(b) produces new cells and destroys the old (haematopiesis)
(c) is a blood reservoir
(d) defends by initiating macrophages to remove microorganisms in blood and phagocytose them
Ans: (a) is the source of lymphocytes before birth and enables lymphocytes to develop into T cells
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