I’ve already explained that life did not just come from nowhere.
It was the flow of excess charged particles called protons that came from vents pumping out heated alkaline fresh water into cooler more acidic salt sea water that created electrical charges, chemical reactions and energy that formed molecules called cells.
It’s like when you scratch a match across a rough surface. There’s no flame in either the match or the rough surface, but the chemical reaction and the energy released from friction creates a spark and thus a flame. The flame doesn’t just come from nowhere, and neither did life.
We are yet to form the full chain. We’ve only been researching these things for a few hundred years and mapping billions of years of evolution is not something that you can just click your fingers and find. There are missing links to the chain all over the place and it could never be fully mapped, but at least we’re trying and not just saying “some spaghetti armed jelly man from behind the Moon did it all in 6 days”.
However, in a more specific time that palaeontologists have been researching, there is evidence of a link between the emergence of larger brained hominids and the occurrences of natural disasters creating severe and immediate climate change in North-East Africa. Every time scientists find and date early human bones, they see that where it appears that the brain volume of these early humans was ever larger it coincided with an event that changed the climate rapidly. Humans get more intelligent when faced with rapid onset climate catastrophes in order to adapt and survive, brain sizes increase through generations and within time you have a different species.