Life on Earth is divided among three domains, or large groupings. Two of these, Archaea and Bacteria, are comprised exclusively of microbes. The third group, Eukaryota, contains both multicellular and microbial life, according to the University of California Museum of Paleontology. This classification system developed in response to a dawning awareness that much of life's diversity is confined to microbes.
Bacteria are among the oldest living things on Earth. Fittingly, this group is also one of the most genetically and morphologically diverse. Some bacteria are destructive to plants and animals, while others live in symbiosis with them. Others are important commercially or as the base of the food chain, as reported by UCMP.
Archaea are some of the hardiest organisms on Earth. This domain is home to the so-called extremophiles that make their living in the superheated water of hot springs as well as hypersaline lakes and deep-sea seeps. Archaea are also abundant among the ocean's plankton. According to UCMP, Archaeans' affinity for extreme environments makes them difficult to culture in the lab.
The third major classification for life is Eukaryota. Eukaryotes are the group that includes all animals, plants and fungi. The group also includes microbes known as protists. This group includes the amoebae and radiolaria.Learn More
In the three-sector theory of economics, the business sector is divided into three types: the primary sector of raw materials, the secondary sector of manufacturing, and the tertiary sector of sales and services. Additionally, some modern theories further elaborate upon the tertiary sector, creating from it a quaternary sector that pertains to information services and a quinary sector related to scientific and cultural advancement.Full Answer >
Pastries are divided into two main categories: non-laminated and laminated. Non-laminated pastries include pie and tart crust, brioche and Pâte à Choux. Laminated pastries include strudel, Danish, croissant, puff pastry and phyllo (sometimes spelled as fillo or filo).Full Answer >
Acorns are divided into two main types for consumption: sweet and bitter. Acorns are the nut of the oak tree, and each type of oak has its own unique acorn.Full Answer >
Archaea, bacteria, Protista, fungi, viruses and microbial mergers are divisions that contain microorganisms. Most microorganisms are single-celled organisms. Baker's yeast and fission yeast are unicellular microorganisms.Full Answer >