This site provides background information and a general description of Cyanobacteria, which are both aquatic and photosynthetic. That is, they live in the water and can manufacture their own food. The site explains the importance of these bacteria in the production of oil deposits. More important, however, is the fact that the oxygen atmosphere that we depend on was generated by numerous Cyanobacteria during the Archean and Proterozoic Eras. Before that time, the atmosphere had a very different chemistry, unsuitable for life as we know it today. In addition, the other great contribution of the Cyanobacteria cited is the origin of plants. The chloroplast with which plants make food for themselves is actually a cyanobacterium living within the plant cells, a process known as endosymbiosis. This site has numerous links for more information.


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