microorganisms, taxonomy

• the 4 groups of microorganisms are: protozoans, bacteria, viruses, and fungi
• taxonomy categories are: domain, kingdom, phylum, class, order, family, genus, species
• domain is the highest level of classification
• phylum is the third highest level of classification
• kingdom is the second highest level of classification
• class is the fourth-highest level of classification
• species is the lowest level of classification
• class is the fourth highest level of classification
• family is the sixth highest level of classification
• genus is the second to lowest level of classification
• order is the fifth highest level of classification