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runig and Hunt (1984) developed four models of public relations that describe the field’s various management and organizational practices. These models serve as guidelines to create programs, strategies, and tactics. “Four Models of PR” by Michael Shiflet and Jasmine Roberts is licensed under CC BY 2.0 In the press agent/publicity model, communications professionals use persuasion to shape the thoughts and opinions of key

What are Protists? Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most, but not all, protists are single-celled. Other than these features, they have very little in common. You can think about protists as all eukaryotic organisms that are neither animals, nor plants, nor fungi. Although Ernst Haeckel set up the Kingdom Protista in 1866, this kingdom was not accepted by the scientific world until the 1960s. These unique organisms can