There are innumerable formally organized groups but I will mention two of them as requested. These are: the ASPCA (American Society for the Prevention of Cruelty to Animals) and the Catholic Church.
firefighters and police officer
NFL Players Assoication and the NFL Team owners
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Vascular and non-vascular are the two major groups.
Laws and leaders.
american red cross and fema
Jews and Armenians.
there are to tyes of fitness general and specific
Duopoly, a specific instance of oligopoly.
Vascular and non-vascular. Vascular are typical plants like trees and flowers. Non-vascular includes mosses, hornworts, liverworts and algae
War comes about when two groups of people with weapons (usually organized into nations or organizations) cannot resolve a dispute amicably and proceed to enforce their will over the other through use of violence.
Elements can be logically organized through classification and hierarchy. Classification groups elements based on shared characteristics or properties, such as organizing animals into categories like mammals, reptiles, or birds. Hierarchy arranges elements in a ranked order, often from most to least important or from general to specific, such as in taxonomies or organizational charts. Both methods enhance understanding by providing structure and facilitating comparisons.