...fungi? (Yes, I have been watching Discovery. No, this isn't about space spores).
A 635 million-year-old microfossil is the oldest land fossil ever found, and it appears to be some kind of fungus, or at least something very like a fungus.
And it dates from about the time Earth unexpectedly broke out of an extended snowball period. We don't know why the Earth thawed.
But it could have been fungi...busily making the seas more fertile, creating oxygen in the atmosphere, making soil...and creating our living world.
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