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Bacteria found living within other bacteria living within insects

The same process that led to the evolution of complex life may be happening all over again in insects, according to a new study in the journal Cell.

About 900 million years ago, the Earth was covered in vast oceans containing giant mats of bacteria. Single-celled organisms with little more than a nucleus topped the food chain. At some point, they engulfed photosynthetic organisms called cyanobacteria, incorporating them into their cells and forming the world’s first proto-plants and algae, according to recent research in the journal Proceedings of the National Academy of Science.

From there, the tree of life blossomed.
 
 

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