GRE Reading Comprehension: OG/PP2-GRE阅读OG/PP2 - 1ILZ48244D5KT422L

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.