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Bigger cities need more infrastructure than smaller ones-but how much more? For instance, among cities in the economically most developed countries, the number of service stations varies, not in direct proportion to the population, but to a far smaller number, obtainable by a precise formula applied to the population. This implies that given a city's population, we can predict how many service stations the city needs. The bigger the city, the fewer gas stations needed per thousand people. The same scaling relationship holds for certain other aspects of infrastructure.
Interestingly, a similar scaling relationship occurs among organisms. Outside their host organisms, almost all mammal cells have similar rates of energy use. But in the animal's body, the larger the animal, the smaller the cells' average at-rest energy needs. Thus an elephant's cells individually consume far less energy than a mouse's. Kleiber's law, which describes mammals' at-rest energy needs, indicates that they increase at a significantly slower rate than body weight. The relevant scaling relationship is described by a formula quite like the one applicable to city infrastructure.
Physicist Geoffrey West has argued that a scaling relationship somewhat like Kleiber's is theoretically likely in systems using a network of branching tubes to convey energy and nutrients efficiently throughout a three-dimensional body. Such a transport system could be the circulatory system's architecture, but also a city's systems of roads, cables, and pipes.
Q1) Which of the following is most strongly supported by the information in the passage?
A. Body size is not the main determinant of a mammal's daily calorie needs.
B. The total daily calorie needs of a population of small mammals that together weigh as much as one large mammal are generally less than the larger mammal's total daily calorie needs.
C. Kleiber's law does not characterize changes in mammals' energy needs as those needs change with increases in level of activity.
D. Small mammals' circulatory systems deliver energy and nutrients more slowly than do larger mammals' circulatory systems.
E. The larger an ecosystem is, the fewer animals per unit of area it can support.
Q2) The primary purpose of the passage's discussion of elephant cells and mouse cells is to?
A. provide an example to indicate that there are exceptions to Kleiber's law
B. extend the application of an idea about the food-energy needs of human populations to the collective food-energy needs of groups of animals
C. illustrate a general principle regarding the relationship between the functioning of organisms and their relative size
D. clarify a point, made earlier in the passage, about the range of size differences among cities
E. suggest the universal applicability of a method for measuring energy consumption in animals
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Bigger cities need more infrastructure than smaller ones-but how much more? For instance, among cities in the economically most developed countries, the number of service stations varies, not in direct proportion to the population, but to a far smaller number, obtainable by a precise formula applied to the population. This implies that given a city's population, we can predict how many service stations the city needs. The bigger the city, the fewer gas stations needed per thousand people. The same scaling relationship holds for certain other aspects of infrastructure.
Interestingly, a similar scaling relationship occurs among organisms. Outside their host organisms, almost all mammal cells have similar rates of energy use. But in the animal's body, the larger the animal, the smaller the cells' average at-rest energy needs. Thus an elephant's cells individually consume far less energy than a mouse's. Kleiber's law, which describes mammals' at-rest energy needs, indicates that they increase at a significantly slower rate than body weight. The relevant scaling relationship is described by a formula quite like the one applicable to city infrastructure.
Physicist Geoffrey West has argued that a scaling relationship somewhat like Kleiber's is theoretically likely in systems using a network of branching tubes to convey energy and nutrients efficiently throughout a three-dimensional body. Such a transport system could be the circulatory system's architecture, but also a city's systems of roads, cables, and pipes.
Q1) Which of the following is most strongly supported by the information in the passage?
A. Body size is not the main determinant of a mammal's daily calorie needs.
B. The total daily calorie needs of a population of small mammals that together weigh as much as one large mammal are generally less than the larger mammal's total daily calorie needs.
C. Kleiber's law does not characterize changes in mammals' energy needs as those needs change with increases in level of activity.
D. Small mammals' circulatory systems deliver energy and nutrients more slowly than do larger mammals' circulatory systems.
E. The larger an ecosystem is, the fewer animals per unit of area it can support.
Q2) The primary purpose of the passage's discussion of elephant cells and mouse cells is to?
A. provide an example to indicate that there are exceptions to Kleiber's law
B. extend the application of an idea about the food-energy needs of human populations to the collective food-energy needs of groups of animals
C. illustrate a general principle regarding the relationship between the functioning of organisms and their relative size
D. clarify a point, made earlier in the passage, about the range of size differences among cities
E. suggest the universal applicability of a method for measuring energy consumption in animals
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.