Feedback mechanism controls the amount and time of hormone release.
You can tell when he works he is messy, which sets him up as a messy worker, with possible mistakes. It shows that the reason he is messy is that he is focused.
This is what I got from this.
<span>D. Old money is scornful of new money; in America, class rivalry can breed stereotypes.
From what Tom says, we know that he is not a big fan of Gatsby. We also know that he is only speculating when he says "I imagined it." Tom does not trust Gatsby as a newly rich person of high society. He also uses stereotypes when talking about how Gatsby came into his riches. We see this when he says, "A lot of these newly rich people are just big bootleggers". His generalization of the newly rich is considered stereotyping.
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D. <span>I think juxtaposition is my favorite word; I love how it sounds.</span>