I wonder how we differentiate between the eukaryotes and prokaryotes.
Eukaryotes (also spelled "eucaryotes") comprise animals, plants, and fungi—which are mostly multicellular - as well as various other groups that are collectively classified as protists (many of which are unicellular).
Prokaryote (also spelled procaryote) comprise any organism that lacks a distinct nucleus and other organelles due to the absence of internal membranes. Bacteria are among the best-known prokaryotic organisms. The lack of internal membranes in prokaryotes distinguishes them from eukaryotes.
Isn't there any other method to know what organisms are eukaryote or prokaryote?