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Command of Evidence SAT question
Reading and Writing · Information and Ideas · Medium · Answer it here, explanation included.
After a volcanic eruption spilled lava into North Pacific Ocean waters, a dramatic increase of diatoms (a kind of phytoplankton) near the surface occurred. Scientists assumed the diatoms were thriving on nutrients such as phosphate from the lava, but analysis showed these nutrients weren’t present near the surface in forms diatoms can consume. However, there was an abundance of usable nitrate, a nutrient usually found in much deeper water and almost never found in lava. Microbial oceanographer Sonya Dyhrman and colleagues believe that as the lava plunged nearly 300 meters below the surface it dislodged pockets of this nutrient, releasing it to float upward, given that blank
Which choice most effectively uses data from the table to complete the statement?
ExplanationShow
Choice B is the best answer. The claim is that the lava freed the deep nitrate, allowing it to float upward. The table supports this by showing that there was more nitrate in the lava-affected seawater at various depths above 300 meters (the depth to which the lava plunged) than in unaffected seawater.
Choice A is incorrect. This choice doesn’t complete the statement in a way that supports the claim. The claim is about nitrate, not phosphate. Choice C is incorrect. This choice doesn’t complete the statement in a way that supports the claim. The claim is only about nitrate—the concentrations of phosphate aren’t relevant. Choice D is incorrect. This choice doesn’t complete the statement in a way that supports the claim. It doesn’t say anything about the seawater inside the lava-affected area.
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