All the bacteria are the single celled organisms which do not have nuclear membrane and nucleus like eukaryotes.
They are a group of single-celled organisms, some of which cause disease. Malaria and dysentery are caused by protozoa.
a bacterium
algae
Protozoans
Single celled organisms include bacteria, protozoa, yeast, and algae. They are pretty much everywhere on Earth. Most of them are too small to see without magnification (usually by means of a microscope). Some of them cause disease.
Protozoans
They are a group of single-celled organisms, some of which cause disease. Malaria and dysentery are caused by protozoa.
cause many celled organisms grow faster
Archaea are a group of single-celled microorganisms. There are no cases of confirmed diseases having been caused by archaea, yet this does not mean that they are not capable of causing disease.
a bacterium
Bacteria is a single celled microscopic organism. Bacteria can cause many different illnesses in humans. Bacteria are generally found in groups, not singularly.
bacteria
bacteria
Protozoans
algae
They are known as protozoa. They include free-living forms (amebas and paramecia) as well as parasites.
An ameoba is a unicellular (one-celled) organism. It is commonly found in aquatic environments, and can cause disease.