Bacteria are prokaryotes and the most metabolically diverse group of organisms. The agents responsible for stomach ulcers, plague, and numerous other diseases. They are also responsible for distinctive flavors of many foods such as yogurt and cheese.
Viruses are obligate intracellular parasites that have a protein coat that surrounds the genetic information
The fungi include molds and yeasts and derive their energy from degrading organic materials
The Protists contain the protozoa and algae.