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Unformatted text preview: ning the cold prehistory of life would be most weakened if which of the following 5.Which of the following best describes the organization were true? of the first two paragraphs of the passage? (A)Cosmic rays are unlikely to trigger the formation of (A) The author cites a basic principle of classical simple molecules. chemistry and then describes the research from (B)Tunneling occurs only in a narrow band of which that principle was developed. temperatures around zero degrees Kelvin. (B) The author cites an apparent contradiction to (C)The synthesis of interstellar formaldehyde can be the principles of classical chemistry and then activated by means other than cosmic rays. explains the process of a chemical reaction to (D)Simple molecules can be synthesized by means of show there is in fact no contradiction. tunneling. (C) the author describes the role of heat in chemical (E)Classical chemical reactions do not occur at reactions and then offers a detailed explanation temperatures close to absolute zero. of its function. (D) The author presents a law of classical chemistry in order to introduce a kind of chemical reaction that differs from it and then explains the essential difference between the two. (E) The author presents the fundamental rules of classical chemistry in order to introduce an explanation of a specific chemical reaction. 183 One explanation for the tendency of animals to be more 6. It can be inferred from the passage that in species in vigilant in smaller groups than in larger ones assumes that the which vigilant behavior is directed at predators, the vigilant behavior—looking up, for example—is aimed at tendency of the animals to be more vigilant in predators. If individuals on the edge of a group are more vigilant smaller groups than in larger ones would most likely because they are at greater risk of being captured, then be minimized if which of the following were true? individuals on average would have to be more vigilant in (A) The vigilance of animals on the periphery of a group smaller groups, because the animals on the periphery of a group always exceeded that of animals located in its interior, form a greater proportion of the whole group as the size of the even when predators were not in the area. group diminishes. (B) The risk of capture for individuals in a group was the However, a different explanation is necessary in cases where same, whether they were located in the interior of the the vigilant behavior is not directed at predators. J. Krebs has group or on its periphery. discovered that great blue herons look up more often when in (C) Animals on the periphery of a group tended to be less smaller flocks than when in larger ones, solely as a consequence capable of defending themselves from attack by predators of poor feeding conditions. Krebs hypothesizes that the herons than animals located in the interior of the group. in smaller flocks are watching for herons that they might follow (D) Animals on the periphery of a gr...
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This document was uploaded on 09/16/2013.

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