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26. Africa, Asia, South America, and Antarctica share some patterns of primitive (fossil) plants and early reptiles, but do not have similar mammal populations. These findings A. cast serious doubts upon the theory of continental drift and fused land masses. B. are an unsolved puzzle probably due to the random nature of biological evolution. C. suggest that a pattern of land bridges existed at different times in geological history. D. suggest that the earlier plants and reptiles evolved while continents were joined, but mammals radiated into diverse groups after separation. E. suggest that the mammals evolved earlier while continents were joined, but plants and reptiles radiated into diverse groups after separation. 27. Which of the following major divisions of geologic time is mismatched with the organisms that flourished during that time period? A. Carboniferous Period—Age of Amphibians B. Mesozoic Era—Age of Reptiles C. Cambrian Period—Age of Fish D. Cenozoic Era—Age of Homo sapiens 28. With the appearance of photosynthetic cyanobacteria and aerobic bacteria during the Precambrian era, A. an oxidizing atmosphere developed on Earth. B. the formation of the ozone shield occurred. C. the amount of UV light reaching the Earth was reduced and chemical evolution slowed. D. All of the choices are correct. 29. All of the following statements concerning the theory of continental drift are true EXCEPT A. the coastlines of several continents are mirror images. B. similar geological structures are found in areas where the continents touched. C. continental drift has ceased. D. the unique distribution patterns of several fossils is explained by continental drift. 30. Mass extinctions v: 02_072014_QC_43242 A. have occurred at least 5 times in the Earth’s history. B. may have been due to climatic changes after meteorite collisions. C. may have been due to changing environments caused by continental drift. D. All of the choices are correct. 31. Fossils from the Paleozoic are plentiful because A. mammals greatly diversified during this time. B. multicellular organisms first evolved during this time. C. this is the time period most studied. D. hard body parts evolved in plants and animals. 32. Fossils used to define and identify geologic periods are ________ fossils. A. body B. index C. trace D. stromatolite  Â

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