What are the similarities and differences between bacteria and protozoa?

The most important difference between them will be the presence of a formalized nucleus in protozoa. Bacteria are organisms that do not have a pronounced nucleus. Protozoa are the first organisms to form a nucleus in their body. In the process of reproduction, bacteria provide for the exchange of genes, but this occurs during recombination, and protozoa provide this process by cell fusion. They also differ in the way they eat. Bacteria are autotrophs, and protozoa are heterotrophs. Another significant difference is size. Bacteria are several times smaller than protozoa. They can only be viewed with a powerful microscope. The simplest organisms can be viewed using a primitive apparatus.