The two correct answers that can help you identify a source as biased or not credible are:
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Emotional language - Sources that use overly emotional language may indicate bias, as they may be appealing to feelings rather than presenting objective facts.
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Spelling errors - Frequent spelling and grammatical errors may suggest a lack of professionalism or care, which can be an indicator that a source is not credible.
Although "a credible author," "documented sources," and "credentials" can also help assess credibility, they do not specifically indicate bias. They are more about the reliability of the information provided rather than identifying bias directly.