Fossil of single celled creatures that date back to at least 3.5 billion years indicate that microbes were the pioneer life forms on earth. Microbes are found everywhere. They can be found in air, water, soil and inside plants, animals and human beings. They can live in any environmental conditions. They are so tiny in size that million microbes can fit into the eye of a needle. Organisms which are not visible to the naked eye are known as microbes. Microbes are part and partial of life. Thus, Understanding microbes is vital to understand past and future. The groups included in this category are bacteria, archebacteria, cyanobacteria, fungi, actinomycetes, protozoans, viruses and mycoplasma etc. These sub groups are not closely related, but are linked to each other only due to their size. "The branch dealing with the study of microorganism is called microbiology". The science of microbiology revolves around two themes such as (i) understanding basic life process and (II) Applying our understanding of microbiology for the benefit of mankind. Based on the branches covered under microbiology are categorized into pure and applied sciences.
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