Chemistry that copies itself
Somewhere in your warm water, near a hot vent or a drying tide pool, the chemistry grew complicated enough to make copies of itself. That is the only line that matters. Once a thing can copy itself with small mistakes, the slow patient editor of natural selection takes over, and life is loose on a world.
A world that breathes
Life remade you from the surface down. Tiny ocean cells learned to drink sunlight and breathed out oxygen, and over ages that oxygen filled your sky and turned it blue. Green spread across your land. You are no longer just a planet. You are a living world, the rarest kind we know, and the only one we have ever found.