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Paleobiology / Evolutionary Biology
Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 4? (Highlighted sentence: "Therefore, the sudden appearance of fossils might not represent a sudden appearance of life, but rather the sudden appearance of preservable materials.") A. The explosion of life was actually caused by the development of materials that could be preserved as fossils. B. Fossils from the Cambrian period are easier to find because they are made of harder materials than earlier fossils. C. The rapid diversification of life might be an illusion created by the lack of fossil evidence from earlier periods. D. Scientists have discovered that preservable materials appeared suddenly during the Cambrian period. official toefl it tests volume 1 read online
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One prominent hypothesis attributes this rapid diversification to changes in the geochemical composition of the oceans. Geological evidence suggests a significant increase in the concentration of dissolved oxygen in seawater during the late Precambrian era. Higher oxygen levels would have supported more metabolically demanding lifestyles. Unlike their anaerobic predecessors, organisms with access to abundant oxygen could develop larger body sizes and more complex tissue structures, such as collagen, which requires oxygen for synthesis. Thus, the lifting of an environmental "oxygen constraint" may have acted as a trigger, allowing genetic potential to be realized in the form of hard shells and segmented bodies. The two Official TOEFL iBT Tests books contain
According to paragraph 2, how did increased oxygen levels affect evolution? A. It allowed organisms to survive without metabolizing food. B. It caused the extinction of soft-bodied organisms. C. It enabled the development of larger bodies and complex tissues. D. It forced animals to move from the ocean to the land.
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Conversely, some researchers argue that the explosion was not merely environmental but genetic. They point to the evolution of Hox genes—regulatory genes that dictate the body plan of an embryo. A mutation allowing for greater segmentation or the duplication of these genes could have provided a "developmental toolkit" that enabled rapid morphological experimentation. According to this view, the explosion was an internal biological innovation that happened to coincide with favorable external conditions.
Unlike third-party preparation books that approximate exam patterns, this guide provides identical structures to actual testing materials.