Evidence for life on Earth dates back to 3.8 billion years ago. This is after the collision that made the moon, but basically immediately after another impact-related total planetary repave event called the Late Heavy Bombardment.
It's possible that there was life here before the Theia collision, life on Theia (RIP), and/or life before the LHB but we will never know because turning to lava and time erased every trace it was ever here.
Microbes are pretty good at surviving unsurvivable apocalypses because they can live miles underground. Still, if there was life before Theia it might not be the same life.
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u/VikingMonkey123 9h ago
Yup. You're reading this, ain't ya?