The two main lineages of prokaryotes that diverged early in life's history are <u>Bacteria and Archean.</u>
According to scientists, the first living organisms on the surface of the earth were prokaryotes: Bacteria, and Archean.
These are single-cell microorganisms without any nuclei and properly developed call structures.
The fossil records indicate that life originated from them and eukaryotes appeared just a billion years ago.
The prokaryote cells lack internal membrane-bounded organelles. They have single circular chromosomes floating inside the cell.
It's because these organisms don't have a proper nucleus that separates chromosomes and other genetic material from the rest of the cell organelles.
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