موضوع انجليزي عن الباكتيريا
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
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