Habitation of early Earth

Based on various methods of geological dating, particularly radiometric analysis, Earth is estimated to be around 4.5 billions years old. This is around the time the Earth's Moon was thought to be created by the impact of Theia, a Mars sized planet, or through a series of impacts.

These impacts would have melted the crust of Earth, extinguishing any signs of previous life or civilisations.

What would be the possibility of life, or even civilisations of some sort, existing on this early Earth before the meltdown?

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Habitation of early Earth

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