GRE Reading Comprehension: OG/PP2-GRE阅读OG/PP2 - ZUUGI6X12GLP46JXP

Which of the following, if true, would help resolve the apparent paradox presented above? A. The number of species of zooplankton living at the bottom of the lake is twice that of species living at the surface. B. Predators of zooplankton, such as whitefish and perch, live and feed near the surface of the lake during the day. C. In order to make the most of scarce food resources, D. hyalina matures more slowly than D. galeata. D. D. galeata clusters under vegetation during the hottest part of the day to avoid the Sun's rays. E. D. galeata produces twice as many offspring per individual in any given period of time as does D. hyalina .