system
Given the following post, respond as if you're commenting on Reddit:
human
What is the name of the first species?

I've tried to google the name of the first organism, but I just get Bacteria or Prokaryotes. What is the earliest classified species of life?
gpt
Well they're long dead, and no fossils exist, so they cannot be formally named. Working backwards from the genomes of modern organisms, we can make some inferences about the most recent common ancestor of all extant life--sometimes called LUCA for "last universal common ancestor". It would necessarily have been a prokaryote, and we can even infer some details of its metabolism--but without direct evidence, we can't formally classify it.

And LUCA was probably far removed from the actual first organism. In fact, in many models of abiogenesis there was no clear first organism, just a set of molecules that become more complex over time and gradually assembled the traits of all modern life. At this point we can do little but speculate.