Microbiology
Microbiology (from Greek , "mīkros", "small"; , "bios", "life"; and , "-logia") is the study of microorganisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells). Microbiology encompasses numerous sub-disciplines including virology, parasitology, mycology and bacteriology.
Microecology
Microecology is a large field which includes many topics such as evolution, biodiversity, exobiology, ecology, bioremediation, recycling, and food microbiology. There are an estimated 1,000,000 different type of microbes that live on this planet of which fewer than 4,500 have been described according to the General Biodiversity Assessment.