The two correct answers that can help you identify a source as biased or not credible are:
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Emotional language - Biased sources often use emotional language to persuade rather than inform, which can indicate a lack of objectivity.
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Credentials - Evaluating the credentials of the author can help assess their expertise and credibility, which is important in determining the reliability of the source.
While spelling errors, documented sources, and a credible author can also provide insights into credibility, the two highlighted options are more directly related to identifying bias.