Of the five kingdoms that house all living beings that move around our planet, the Monera kingdom is the one that groups all microorganisms, made up of a cell that does not have a defined nucleus. Generally, an equality is usually established between these and all beings called "prokaryotes", which would also correspond to the definition mentioned above. However, in recent years, scientists have suggested that this traditional conception of what the kingdom is completely out of date, since it is said that they are two different groups, such as archaea and bacteria.
The word "monera" originates from the Greek "μονήρης" or "moneres", which can be translated as "simple", referring to the fact that this group of living beings is the simplest of all those studied. This group, initially, was included by Haeckel, the man who was in charge of grouping the kingdoms, in the protist kingdom, as a branch of the simplest microscopic organisms; In it, not all the specimens were included, all the prokaryotes that were known until that time, in addition to the fact that others were found in other kingdoms, such as the plantae, where algae were used to be located. Years later, Edouard Chatton proposed the use of prokaryote and eukaryote as we know it today.
The organisms belonging to this group have a series of characteristics, such as: they are the smallest living beings on Earth; almost all are unicellular; they do not have the presence of organelles, such as plastids or the cell nucleus itself; generally speaking of osmotrophic organisms; finally, its reproduction is asexual.
