The author was being Argumentative in this article. The author argues that we cannot live on caffeine and why. As stated in the article "When you get down to it, why can't humans live on caffeine" The Author is asking a question which will start the argument. Another piece of evidence "We don't the gear to digest deriatives further" she explains her reason why we can't live off of it unlike other animals. A third piece of evidence "But cows, rabbits, and other grass munching creatures are able to extract calories" She Tells of other animals that they can do it by than tell why they can unlike how we cannot digest certains things like cellulose. I can actively learn about this by researching more into caffeine and what is required to digest this substance.Caffeine can't be used to sustain our life, but it can for others who have the ability to work with it.
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