Why did Linnaeus not include classification for archaea and bacteria?

Linnaeus did not include classification for archaea and bacteria because his system of taxonomy was developed in the 18th century, long before the discovery of these microorganisms. At that time, the understanding of living organisms was limited, and the microscopic world was largely unexplored. The distinction between prokaryotes (like bacteria and archaea) and eukaryotes was not recognized until much later, with advancements in microscopy and molecular Biology in the 19th and 20th centuries. Consequently, Linnaeus focused primarily on plants and animals, which were the more visible and understood forms of life during his time.