Q31 by competing with rodents for seeds black ants

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Q31: By competing with rodents for seeds, black ants help control rodent populations that pose a public health risk. However, a very aggressive species of blank ant, the Loma ant, which has recently invaded a certain region, has a venomous sting that is often fatal to humans. Therefore, the planned introduction into that region of ant flies, which prey on Loma ants, would benefit public health. Which of the following, if true, most strengthens the argument? A. Ant flies do not attack black ants other than Loma ants. B. Loma ants are less effective than many bird species in competing with rodents for seeds. C. Certain other species of black ants are more effective than Loma ants in competing with rodents for seeds. D. The sting of Loma ants can also be fatal to rodents. E. The use of pesticides to control Loma ants could have harmful effects on the environment. Answer: ------------------------------------------------------------------------------------------------------------ Q32: Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria. Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria. The statements above, if true, provide the most support for which of the following conclusions? 27
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A. Mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way. B. Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections. C. In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated. D. When a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouse’s body decreases. E. Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection. Answer: ------------------------------------------------------------------------------------------------------------ Q33: For the last five years the Dutch economy has grown faster than Britain, France, or Germany, with the unemployment rate having remained well below that of the other three countries. ------------------------------------------------------------------------------------------------------------ Q34 to Q37: A small number of the forest species of lepidoptera (moths and butterflies, which exist as caterpillars Line during most of their life cycle) exhibit (5) regularly recurring patterns of popu- lation growth and decline—such fluctuations in population are known as population cycles. Although many different variables influence popula- (10) tion levels, a regular pattern such as a population cycle seems to imply a dominant, driving force. Identification of that driving force, however, has
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