self-sustained oscillations
61community ecology — Introduction study of the organization and functioning of communities (community), which are assemblages of interacting populations of the species living within a particular area or habitat. As populations of species interact with one …
62Main sequence — A Hertzsprung Russell diagram plots the actual brightness (or absolute magnitude) of a star against its color index (represented as B V). The main sequence is visible as a prominent diagonal band that runs from the upper left to the lower right.… …
63Economic stratification — refers to the condition within a society where social classes are separated, or stratified, along economic lines. Various economic strata or levels are clearly manifest. While in any system individual members will have varying degrees of wealth,… …
64Operation Sandblast — Part of Cold War (1953–1962) …
