Key differences:

* Nucleus: Prokaryotic cells lack a true nucleus, while eukaryotic cells have a well-defined nucleus that contains their DNA.

* Organelles: Prokaryotic cells have fewer membrane-bound organelles compared to eukaryotic cells.

* DNA structure: Prokaryotic DNA is circular and located in the cytoplasm, while eukaryotic DNA is linear and enclosed within the nucleus.

* Size: Prokaryotic cells are generally smaller than eukaryotic cells.

* Complexity: Prokaryotic cells are simpler in structure and function than eukaryotic cells.

Evolutionary History:

* Prokaryotic cells are believed to have evolved billions of years ago, long before eukaryotic cells.

* Eukaryotic cells are thought to have evolved from prokaryotic cells through a process called endosymbiosis, where smaller prokaryotic cells were engulfed by larger ones and eventually became organelles.

Conclusion:

The simpler structure, lack of a nucleus, and earlier evolutionary origin of prokaryotic cells indicate that they are more primitive than eukaryotic cells.