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Newly described wormlike fossils dating back over half a billion years might be our oldest ancestors, and researchers have mapped and visualized the physical structure of the microscopic communities growing on human tongues!

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Sources:

Ancient Bilaterian
https://www.pnas.org/content/early/20…
https://www.eurekalert.org/pub_releas…

Tongue Microbe Spatial Ecology:
https://dx.doi.org/10.1016/j.celrep.2…
https://www.pnas.org/content/108/10/4…
https://www.sciencedirect.com/science…
https://www.frontiersin.org/articles/…
https://www.eurekalert.org/pub_releas…

Images:

Thumbnail: https://www.eurekalert.org/multimedia…

https://www.eurekalert.org/multimedia…
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https://www.eurekalert.org/multimedia…
https://www.eurekalert.org/multimedia…

https://www.eurekalert.org/multimedia…