Answer: Protistans
Explanation: The first appeared eukaryotes were from the kingdom protista. This kingdom consists of many organism that includes both unicellular organism and multicellular organism.
The eukaryotic organism are more complex as compared to that of prokaryotes and they have specialized organelles for performing a variety of function necessary for the survival of the organism.
Example: The DNA of the eukaryotic organisms are packed in a membrane structure known as nucleus which is absent in the prokaryotes.