According to the passage, lowlands in the Amazon basin currently differ from uplands in which one of the following respects? A. Lowlands are desertlike, whereas uplands are lush. B. Lowlands are less vulnerable to glaciation during the ice ages than are uplands. C. Uplands support a greater diversity of species than do lowlands. D. Uplands are wetter than are lowlands. E. Uplands are more densely populated than are lowlands.