Was life formed from nonliving things 3.5 and 4.6 billion years ago?

Answer 1

4.6 billion years ago, our planet was far too hot to permit life of any kind. Indeed, life would have been difficult here even during the Late Heavy Bombardment (LHB), which occurred about 4.0 billion years ago.

There is strong evidence of cellular life here about 3.55 billion years ago. That would indicate less complex life would have been here before then, or "soon" after the LHB. In the same way the scientists don't know why we have lightning in the sky, scientists aren't certain how or when life arose on our Earth. If it arose from non-living chemicals soon after the LHB, the process was unexpectedly quick. This has led some sceintists to hypothesize that chemicals for life came from outside our immediate solar system. At present, studies are ongoing.