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Dzidzira Tsananguro:
Ichi chiitiko chebiological ... simbi isina, mercury yakachengeteka uye isina fluoride. Masevhisi aripo anosanganisira mercury kuchengetedza kubviswa, ozone yekudzivirira, kudzivirira uye kurapwa, bio kuenderana bvunzo uye nitrous oxide yekushushikana.