Microbes Living Deep Below Earth’s Surface Could Be Remnants of Ancient Life Forms – ScienceAlert

There’s an enormous variety of life thriving deep beneath Earth’s surface. A new analysis of two major groups of subsurface microbes has now revealed that their evolutionary path to life in the dark has been more curious than we expected.
In our planet’s first 2 billion years of existence, there was no oxygen in the atmosphere. Once the air on our blue planet changed, not all life forms adapted, with many microbes retreating into less oxygenated parts of the planet.
Patescibacteria and DPANN a…

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