1. Bacteria
* Escherichia coli (E. coli)
* Staphylococcus aureus
* Streptococcus pneumoniae
* Salmonella enterica
* Bacillus subtilis
2. Archaea
* Methanosarcina barkeri
* Halobacterium salinarum
* Pyrococcus furiosus
* Sulfolobus acidocaldarius
* Archaeoglobus fulgidus
3. Fungi
* Saccharomyces cerevisiae (Baker's yeast)
* Aspergillus niger
* Penicillium chrysogenum
* Rhizopus stolonifer
* Neurospora crassa
4. Protozoa
* Paramecium caudatum
* Amoeba proteus
* Euglena gracilis
* Plasmodium falciparum (Malaria parasite)
* Trypanosoma brucei (African sleeping sickness parasite)
These microorganisms are just a small sample of the vast diversity of microbial life on Earth. Microorganisms play essential roles in various ecosystems, contribute to biogeochemical cycles, and have a significant impact on human health and well-being.