Answer:
Bacteria and protozoa are examples of unicellular organisms.
Explanation:
Bacteria are prokaryotic organisms in which the genetic material is not enclosed in a membrane. Bacteria are one of the oldest groups on Earth. Bacteria may inhabit diverse environments such as the deep ocean, soils, acidic hot surfaces, radioactive materials, etc. On the other hand, protozoa (also known as protozoan) are unicellular, heterotrophic, eukaryotic microorganisms, whose genetic material is enclosed within a nucleus that has a membrane. This group was originally considered to be animals because they have animal-like features including, for example, motility and predation.
