Mbere ya byose, ubuso bwumuringa muremure cyane buzakora urwego rukingira, nubwo rwaba amavuta, karubone, bagiteri na mikorobe, amazi yangiza, umwuka wa ogisijeni cyangwa imirasire ya ultraviolet, ntishobora kunyuramo, ntanubwo ishobora kwangirika ngo ihumanye ubwiza bwamazi, kandi parasite irashobora ...
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