up vote 3 down vote accepted. $\pi$ is the name of the constant relating the diameter and circumferance of a circle. It's a definition, a particular constant that we thought deserved a name. $e$ happens to be the name of a constant from a particular limit. Like $\pi$, we named it because we thought it would be useful. In Physics, many, many constants have names. Gravitational constants, expansional constants, electrical constants, etc. Each is useful, but somewhat arbitrarily chosen.
Bacteria: The Monera Kingdom Bacteria are classified into two groups: Eubacteria (true bacteria) and Archaebacteria (Ancient Bacteria). They are autotrophic. 28-1 Chapter 28: Microbiology. 28-2 Viruses Viruses are noncellular, nonliving particles and therefore are not included in the classification scheme.
The three-domain system of classification groups organisms into the following 3 ca â¦ tegories:   # Bacteria  # Archaea/archaeabacteria  # Eukarya   Bacteria and Archaebacteria are both include unicellular prokaryotes but there are differences between in their genetic material and proteins.rom the classification system, then, the Eukarya domain would contain all members of kingdoms Protista, Fungi, Plantae, and Animalia.