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Bacteria are microscopic, unicellular, prokaryotes, least complex and are omnipresent
A V Leeuwenhoek first observed bacteria (1676) and called 'animalcules' meaning tiny animal.
Ehrenberg coined the term bacteria (1838) meaning stick or rod shape structure.
Each bacterium is enclosed by a rigid cell wall composed of peptidoglycan, a protein-sugar (polysaccharide) molecule
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