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What is a cyanobacterium?
Quick Answer
A cyanobacterium is a photosynthetic bacterium that uses sunlight to make energy. Cyanobacteria helped produce much of Earth’s oxygen billions of years ago.
The Full Story
Cyanobacteria are bacteria that perform oxygen-producing photosynthesis, unlike most other bacteria. They played a major role in changing Earth’s atmosphere billions of years ago, helping raise oxygen levels over geological time. Many also form blooms in lakes and oceans, and some species can produce toxins. Cyanobacteria are sometimes called blue-green algae, but they are bacteria, not true algae.
Key Facts
1.Perform oxygen-producing photosynthesis
2.Helped oxygenate Earth’s atmosphere over time
3.Can form harmful blooms in water
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"The bacteria that helped fill Earth with oxygen"
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