Prove what? That scientists imagine, guess, conjecture, how they think life got started? and developed from there? lol, I've already proved that by showing you that they are still debating how it all happened "at the beginning." They don't know, therefore they guess. Imagine. Suppose. Conjecture. And that beginning necessarily in scientists' minds leading to another possibility (guess, conjecture) -- now that of prokaryotes as the first living beings. I'm not telling you what to believe. Obviously. I'm not a scientist so I can use the word "proof" there.
Get it?
Just in case, I'll repeat--the concept of abiogenesis is debated (not known how it started) by scientists. They GUESS how life may have gotten started on the earth. They don't KNOW. And == There canNOT be the concept of or happening of evolution as construed by scientists without abiogenesis.
Now believe it or not, don't break that 9th again.