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IPFS News Link • Science

Origin story

• arclein

When they work backwards, they travel through the fossil record, and through the branches of genetic relationships between species. They also look for geochemical signatures that mark life's presence in the distant past. Somewhere at the end of the line lies life's oldest ancestor. This ancestor has acquired a name: LUCA, the last universal common ancestor. It also has a hypothetical nature and place in the biological order of things: LUCA is a microorganism or group of microorganisms from which all life on Earth descends. Though scientists, such as the molecular biologist Will