Answer:
The major difference between protista from bacteria and aechaea is in their cellular organization. Prostists are eukaryotes which is made up of single cell or multiple cells while bacteria and archaea are single cellular prokaryotes.
Due to eukaryotic in nature protists have well defined nucleus which contain their genetic material in compact form while bacteria and archaea do not contain nucleus and their genetic material is scattered in the cell.
Protists also contain small compartmentalized organelles while bacteria and archaea do not contain compartmentalized organelles which proves that protists are more evolved than bacteria and archaea. Bacteria are found everywhere but protists are found only in moist places.