All Bacteria and Archaea are Microorganisms, but Only Some Eukaryotes

Question

All bacteria and archaea are microorganisms, but only some eukaryotes are microorganisms.

Accepted Answer

Bacteria and archaea are always microorganisms because of their small size, but some eukaryotes, such as fungi and protists, can be either microorganisms or macroorganisms depending on their size and complexity. For example, yeast is a eukaryotic microorganism, while a tree is a eukaryotic macroorganism.