To identify a source as biased or not credible, the two correct answers are:
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Emotional language - This can indicate bias, as it often aims to provoke a strong emotional response rather than provide objective information.
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Spelling errors - Frequent spelling errors can undermine the credibility of a source, as they may suggest a lack of professionalism or care in the publication.
While having a credible author and proper credentials can also be factors in assessing credibility, they do not specifically indicate bias. Documented sources can be credible or biased depending on the context.