The two main lineages of prokaryotes that diverged early in life's history are Bacteria and Archean.
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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