Microorganisms, also known as microbes, are tiny living plants or animals which cannot be seen by the naked eye and instead must be observed using a microscope. ... These foods are commonly (but no always) of animal sources to begin with, such as meats, milk or eggs. ... Commonly found in raw meat, vegetables and processed foods, it can cause fevers, headaches, fatigue. ... To preserve food means to treat it to prevent the decaying process, and this is done by removing one of more of the things that micro-organisms require to reproduce. ...

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• Grade Level: High School