موضوع انجليزي عن الباكتيريا
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موضوع انجليزي عن الباكتيريا
The bacteria are very small microbes . some bacteria are useful , we call it positive bacteria other are harmful . the useful bacteria are used for making vitamins . the harmful bacteria cause diseases , they destroy our food . they live everywhere . we. can see them with a microscope:b42::b42: |
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