Cyanobacteria belong to the domain "Bacteria." The taxonomic classification of living organisms is composed of several levels, including kingdom, phylum, class, order, family, genus, and species. The domain "Bacteria" is one of three domains of life and contains all single-celled prokaryotic organisms that lack a nucleus and membrane-bound organelles.
Cyanobacteria are a group of photosynthetic bacteria that are often referred to as blue-green algae. They are some of the oldest living organisms on Earth, and are found in a wide range of environments, including freshwater, marine, and terrestrial habitats. Cyanobacteria are important for several reasons, including their ability to produce oxygen through photosynthesis, their role in the nitrogen cycle, and their use in the production of biofuels.
Therefore, cyanobacteria belong to the domain "Bacteria," and are a type of prokaryote. The other two domains, "Eukarya" and "Archaea," contain eukaryotic organisms and some prokaryotes, respectively.
