Final answer:
Prokaryotes lack a nucleus, while viruses are not living organisms. Eukaryotes have a nucleus and other organelles.
Explanation:
Prokaryotes are microorganisms characterized by the absence of a nucleus. These organisms include bacteria and archaea.
Viruses are also microorganisms that lack a nucleus but are not considered living organisms due to their inability to carry out metabolic processes without a host cell.
Eukaryotes, such as fungi and protists, have a nucleus and other membrane-bound organelles, unlike prokaryotes.
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