Answer:
Eukaryotes have a nucleus; Prokaryotes do not or option A
Step-by-step explanation:
While it is true that eukaryotic cells have a nucleus and prokaryotic cells do not, this is not a fundamental aspect of the cell theory. The three fundamental principles of the cell theory are that: (1) all living organisms are composed of one or more cells, (2) the cell is the basic unit of structure and function in living things, and (3) all cells arise from pre-existing cells.