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Microbes are minute organisms that can not be seen by the naked eye and yet occupy a wide variety of habitats. Microbes tend to be referred to as viruses, bacteria, fungi or protozoa and are known to cause infectious diseases. Many microbes, however, form a close co existence with us as humans, often benefiting our health rather than damaging it [1].

Microbes predate us greatly, appearing approximately three and a half billion years ago compared to our just-over 100,000. It is due to their metabolic activities that the uninhabitable conditons on Earth became fit for animal life. For example, microbes are the only known species to have the ability to fix nitrogen [2].


  1. What Are Microbes, April 2012. National Institute of Allergy and Infectious Diseases. [online] Available at: http://www.niaid.nih.gov/topics/microbes/pages/default.aspx/Pages/default.aspx [Accessed 16th October 2014]
  2. Ingraham, John L.(2010) March of the Microbes: 1-3,USA: Belknap Harvard.

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