The smallest organisms are found in Kingdom Monera or the Moneran Kingdom.
The kingdom that contains the smallest organisms is the Monera kingdom, which includes bacteria and archaea. These organisms are unicellular and have simple cellular structures compared to other kingdoms.
I believe nanobes(of the microorganism family) are the smallest known living organisms at a size of (20 nm = .02 microns) being the smallest.
Organisms made of prokaryotic cells are found in the Kingdom Monera.
The kingdom with the smallest organisms is the Monera kingdom, which includes prokaryotic organisms such as bacteria and archaea. These unicellular organisms are typically microscopic and can be as small as 0.2 micrometers in diameter. Monera encompasses a vast diversity of life forms that can thrive in various environments, often outnumbering other kingdoms in terms of individual organisms.
A cell without a distinct nucleus is in the kingdom Prokaryota. Other cells (Eukaryota) are in either the Animal or Plant kingdom
Pipistrelle
plantea
The smallest microbes in the protist kingdom are generally considered to be the marine algae known as picoplankton. These are single-celled organisms that are just a few micrometers in size. They play a significant role in the marine ecosystem as primary producers.
Phototrophic organisms are found in the Kingdom Protista, specifically in the subgroups of algae and some protists. These organisms use light to produce energy through photosynthesis.
The organisms found in the kingdom Animalia are multicellular, heterotrophic organisms that lack cell walls. They exhibit diverse characteristics and behaviors, ranging from simple sponges to complex mammals.
Kingdom Plantae
eubacteria is the smallest kingdom