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When feeding, aquatic birds known as phalaropes often spin rapidly on the water's surface, pecking for food during each revolution. To execute these spins, phalaropes kick one leg harder than the other. This action creates upwelling currents. Because plankton on which phalaropes feed typically occurs in greater quantities well below the surface, it is hypothesized that by spinning phalaropes gain access to food that would otherwise be beyond their reach.

Which of the following, if true, most strongly supports the hypothesis?

【选项】Phalaropes do not usually spin when food is abundant at the surface.

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题目基本信息

  • 所属科目:逻辑CR
  • 题目来源1:PREP08 Test 1-82
正确率:55%