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.
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