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Bo'yash va chop etish uchun mikroblar va bakteriyalar, viruslar va boshqa kichik organizmlar. Mikroorganizm yoki mikrob mikroskopik o'lchamdagi organizm bo'lib, u bitta hujayra yoki hujayralar koloniyasi sifatida mavjud bo'lishi mumkin. Mikroorganizmlar juda xilma-xil yashash joylariga ega bo'lishi mumkin va qutblardan ekvatorgacha, cho'llar, geyzerlar, toshlar va chuqur dengizlargacha hamma joyda yashashi mumkin. Ba'zilari juda issiq yoki juda sovuq sharoitlar kabi ekstremal sharoitlar uchun, boshqalari yuqori bosim uchun, ba'zilari esa yuqori radiatsiyaviy muhitlar uchun mo'ljallangan. Bolalar uchun mikroorganizmlarni, viruslarni va bakteriyalarni bo'yash muhim, ular ularni bilishlari va yuvilmasa, qo'llarida nima yashayotganini bilishlari kerak.
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