Here are the matches for each example with the corresponding characteristic:
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Anonymity: An article on a website about plants that are toxic to pets does not list an author.
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Omission: A pamphlet includes two sources of data that supports the reputation of a particular product.
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No expertise: A blog entry about the safety of different brands of car seats was written by a company salesperson.
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Fringe ideas: A blog post references a theory that differs from the scientific community.