Microbiology is a branch of biological science and includes the study of microscopic living beings both plant and animal such as bacteria. Bacteria belongs to a group of living organisms known as microbes without distinction regarding whether they are plants or animal. They are so called because of their small size. The study of micro organisms is a basic prerequisite because bacteria resume as living models.
The very best human eyes, unaided, failed to see objects less than about 100mm. So there was a need to make use of magnifying lens and see the microscopic objects. Robert Hooks made and used a compound microscope and observed moulds.
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