Usafi ni kitendo cha kuondoa uchafu,vumbi na vitu visivyohitajika tena ilikuweka mazingira katika hali ya usafi na kujikinga na bacteria hatari na vijidudu .
Uchafu ni mkusanyiko wavitu mbalimbali visivyohitajika tena kwa matumizi kama vile mabaki ya chakula ,maji machafu , makaratasi ...
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