Comparing virus, bacteria, protists and prion

Bacteria: They are a not plants or animals but are also living things. Their sizes range generally really small, like other cells. They are in packs of thousands or maybe millions at once. Bacteria however, may be useful in enchancing the immune system, help with diarrhea, irritable bowl syndrome, and vaginal flora. Bacteria may also multiply at a very fast rate which may be harmful.

 Prions: They are a protein which similarities of a virus but does not have nucleic acids. They are said to be a infecting agent to the nervous system. Many of its damages are done to the brain where it may attack the tissue. Unlike the others, the prions are not contagious and does not spread

Virus: They are not animals, plants, nor bacteria. A host cell is required for them to function and survive. They have their own distant kingdom. They consist of a capsid, rod, tails, and a sheeth.
Protist: From the kingdom protista, they are made up of single or multiple cells. These are considered to be eukaryotic and they are very diverse. They have a anal pore, pecillcle, cilia, micronucelus, contractile vacuole, food vacuole, trichocysts, gulliet, and macronucleus. They cannot be identified as animals, plants etc.

Sources: Google Images, Wikipedia, Campbells biology,
www.biologycorner.com/bio1/