Keisha was reporting to her class about the benefits of caffeine. She stated that it heightened alertness. She also showed graphs of repeated trials. She got all of her information from an Internet site with an unknown source.

A claim is only as reliable as the evidence supporting it. Although Keisha showed graphs from repeated trials, the information came from an Internet site with an unknown source, so its credibility cannot be checked. Therefore, her claim was weak because her sources were unreliable.

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