When a snake flicks its tongue, it is gathering odor particles for transfer to two fluid-filled sacs at the roof of the mouth -- Jacobson's organs -- that lead to a second, smaller olfactory chamber. The tongue is used only to assist in this process; snakes do not have a sense of taste.
A eukaryote is a type of cell (or unicellular organism) that possesses a nucleus and membrane-bound organelles, in contrast to prokaryotes (bacteria and archaea) which don't. Eukaryote means good/true nut/kernel in Greek, referring to the nucleus, while prokaryote means before nut/kernel.
Eukaryotes can be defined as the group of organisms that possess a membrane bound nucleus along with the membrane bound organelles. Eukaryote includes both unicellular and multicellular organisms. Organisms, with this cell type are known by the term eukaryotic organisms (or) eukaryotes. Examples of Eukaryotes.