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Microorganisms were the first living creatures on earth. It is estimated there are a total of 5 nonillion microorganisms on earth (5x1020). You will find nearly 10 million a millilitre of ocean water and 40 million in a gram of soil. They are also ubiquitous on the human body.
This Wiki Article provides an introduction to microorganisms common in cheese making. Microorganisms are organisms that are unicellular or live in a colony of cellular organisms such as bacteria, fungi, archaea, and protists; microscopic plants (green algae); and animals such as plankton and the planarian.