During the day in Lake Constance, the zooplankton D. hyalina departs for the depths where food is scarce and the water cold. D. galeata remains near the warm surface where food is abundant. Even though D. galeata grows and reproduces much faster, its population is often outnumbered by D. hyalina. Which of the following, if true, would help resolve the apparent paradox presented above? ["D. galeata clusters under vegetation during the hottest part of the day to avoid the Sun's rays.", 'The number of species of zooplankton living at the bottom of the lake is twice that of species living at the surface.', 'In order to make the most of scarce food resources, D. hyalina matures more slowly than D. galeata.', 'Predators of zooplankton, such as whitefish and perch, live and feed near the surface of the lake during the day.']