These bacteria has evolved for 3 or so billion years on earth according to fossil records. These are the little buggers who are responsible, to have made the earth habitable by producing oxygen into the atmosphere. They erxist singularly or in blooms anywhere on earth, water, soil rock etc.. The ability fix nitrogen as a gas makes them ideal plant food rich in nitrates etc.. As I noted earlier they have a habit of using sunlight and water to produce oxygen. THe carbon dioxide is converted into carbohydrates. boffins beleave that chloroplasts in plants evolved from these bacteria. Many Proterozoic oil deposits are attributed to the activity of cyanobacteria.
Thanks to Wikipedia and webpage.
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