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According to the passage, the immobilization hypothesis fails to account for which of the following facts?
Benjamin Franklin is portrayed in American history as the quintessential self-made man. In "Self-reliance", Emerson asks, "Where is the master who could have instructed Franklin...?" In fact, Franklin took instruction widely, and his scientific work was highly collaborative. Friends in England sent equipment needed for his electrical experiments, others, in Philadelphia, helped him set up his workshop there. Philip Syng constructed a device for generating electrical charges, while Tomas Hopkinson demonstrated the potential of pointed conductors. Franklin, in addition to being the group`s theoretician, wrote and published its results. His fame as an individual researcher is partly a consequence of the shorthand by which when one person writes about a group`s discoveries, history sometimes grants singular credit for collective effort.
There have long been dead zones-water too low in oxygen to sustain most forms of life-in the Gulf of Mexico, which receives the waters of the Mississippi River. Scientists studied sediment cores from areas where the gulf`s most recent dead zone occurred. The scientists dated the sediment and counted species of foraminifera (marine protozoans) in the sediment; these species thrive in low-oxygen waters. As far back as 1823, the foraminifera thrived especially during Mississippi River flood years (during which nutrients levels increase), suggesting that nutrients in floodwaters can trigger low oxygen water. The foraminifera in the core samples were most abundant after 1950, when farmers began using some fertilizer, which is rich in nutrients. Researchers believe that increased use of fertilizer leads to more-extreme dead zones.
Which of the following best describes the function of the highlighted sentence in the context of the passage as a whole?
Which of the following best describes the function of the highlighted sentence?
Which of the following best describe the function of the highlighted sentence?
According to the passage, which of the following is an assumption that may be invalidated by recent seismological evidence?

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