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Mikroobid ja bakterid, viirused ja muud vĂ€ikesed organismid vĂ€rvimiseks ja trĂŒkkimiseks. Mikroorganism ehk mikroob on mikroskoopilise suurusega organism, mis vĂ”ib eksisteerida ĂŒksiku raku vĂ”i rakukolooniana. Mikroorganismidel vĂ”ib olla vĂ€ga erinevaid elupaiku ja nad vĂ”ivad elada kĂ”ikjal poolustest ekvaatorini, kĂ”rbetes, geisrites, kivides ja sĂŒvameres. MĂ”ned neist on mĂ”eldud ekstreemsete tingimuste jaoks, nagu vĂ€ga kuumad vĂ”i vĂ€ga kĂŒlmad tingimused, teised kĂ”rge rĂ”hu jaoks ja mĂ”ned kĂ”rge kiirgusega keskkondade jaoks. Laste jaoks on oluline mikroorganisme, viiruseid ja baktereid vĂ€rvida, et nad tunneksid neid ja teaksid, mis elab nende kĂ€tel, kui neid ei pesta.
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
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