From the article:
Biologists say they have solved the riddle of how a tiny bacterium senses light and moves towards it: the entire organism acts like an eyeball.
Despite being just three micrometres (0.003mm) in diameter, the bacteria in the study use the same physical principles as the eye of a camera or a human.
This makes them “probably the world’s smallest and oldest example” of such a lens, the researchers write in the journal eLife.
Cyanobacteria, including the Synechocystis species used in the study, are an ancient and abundant lifeform. They live in water and get their energy from photosynthesis – which explains their enthusiasm for bright light.
“Cyanobacteria are 2.7 billion years old, so it’s much older than any animal eye. Presumably, this mechanism has existed for a very long time.”More.
All just happened suddenly one day, to a single cell …
See also: Can all the numbers for life’s origin just happen to fall into place?
Stasis: Life goes on but evolution does not happen
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