Mfumo wa kinga ya binadamu una seli, seli hizi hufanya kulinda mwili wako kutoka kwa bakteria, virusi, na maambukizo mengine.
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10 Ukweli Wa Kuvutia About The intricacies of the human immune system and its functions

10 Ukweli Wa Kuvutia About The intricacies of the human immune system and its functions